Re: Stus-List Strengths of Various Adhesives mostly concerning portlights/windows

2015-10-22 Thread Dennis C. via CnC-List 
Nice job, Derek.

Let me add to your post.

When I installed new ports in a 26 footer  (non C) couple weeks ago I had
similar thoughts and concerns.

I dry fiitted ports in place and held them with tape.  I then traced the
outline of the inside of ports on the protective film and removed film from
adhering surfaces.  Then took them to local glass shop where they applied a
special black paint on the adhering surfaces.  Don't know any details on
the paint but they said it actually improved adhesion.  It was matte and
slightly rough.  With the paint, I didn't have to worry about bubbles or
gaps in the sealant showing through.

After taping the outside of the port landings and the inside of the ports,
I applied a generous bead of black LifeSeal and installed the ports flush
wiith the cabin sides.  I had several pieces of wood furring or filler
strips precut.  I placed the strips against the ports and clamped them to
the lifelines with clamps to hold pressure on the ports.

Note:  the key here is to apply one large bead of sealant.  If you apply
two adjacent beads, you may trap air between the beads which will show if
you don't do the paint.

While the sealant was still fresh, I ran the backside of a plastic spoon
around the gap between the port lens and cabin side to create a nice
concave look.  Note: run the spoon in ONE direction only.

I didn't use any spacers.  Just made sure the lens was uniformly flush with
the cabin side and that I got lots of "squeeze out" around the gap.

Next day I removed strips and tape.  Any stray sealant was removed with a
pencil eraser.  Didn't want to use an adhesive remover for fear of damaging
the concave seal.

Done.  Nice job.  Pat on back.

Furring or filler strips are about 1.5 inches wide x 1/4 inch thick and can
be bought in 8 foot lengths at a big box store for about $1 each.  The
clamps were the 4 inch pony spring clamps that are about $4.

Dennis C.
Touche' 35-1 #83
Mandeville, LA
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Re: Stus-List Strengths of Various Adhesives mostly concerning portlights/windows

2015-10-22 Thread Derek McLeod via CnC-List 
When I replaced my portlights this spring I had planned to follow Don Casey's 
article but ended up not using the VHB. 

I have had good experience with VHB on a residential installation of steel 
panels as a surround for a gas fireplace. The VHB is bonding mild steel to 
painted drywall in this case and performs very well considering the temperature 
variation. So I like it and what it is capable of. 

When it came to the portlights, I had read that the expansion of the acrylic 
relative to the fibreglass is what causes the bond to fail, or could cause 
crazing/cracks in the acrylic. To get enough movement/flex out of the adhesive 
(or tape) it should be 3/16" to 1/4" thick between the fibreglass and acrylic. 
My portlights are approximately 60"x8" btw. I couldn't source the thicker VHB 
in Toronto, aside from a couple other concerns. The Casey article mentions 
backpainting the acrylic to hide the typically grey colour VHB. I became 
worried that the paint used then becomes the bonding surface which I can't 
really prove sticks as well to the acrylic. There was also a worry that the 
chemicals in the paint could etch and/or cause crazing in the acrylic -even the 
data sheet for Krylon Fusion had things that attack acrylic in it. I decided it 
might be best not to risk using the paint and just double up the thinner VHB 
that I could source locally. I then got to worrying that the VHB might not be 
UV stable behind the acrylic... and I didn't want to repeat this task for a 
while.

Finally, I picked up a case of Dow 795, since that was all I could find around 
here for quantity. I had read that you could install screws into the window 
recess to act as spacers for the 795, giving enough gap to allow the silicone 
to flex with the acrylic. I was concerned that the screws would be visible 
which didn't seem so great. I thought about the spacers that glass installers 
use for shower surrounds and mirrors and then thought about making spacers with 
the 795 itself. I spoke with a tech rep at Dow and he confirmed that unlike 
typical run of the mill silicone, 795 would in fact stick to itself. So I 
gooped lines of 795 on some scrap plastic, waited a week for it to cure, and 
cut it into little tiny bricks about 3/16"x3/16"x1". I did a tiny blob of 795 
behind these in the window recess with the spacers every 8" or so and then 
applied lots of 795 to bond the acrylic. I also sanded the bonding surface of 
the acrylic with 220 and wiped with isopropyl alcohol to clean. In retrospect, 
it would have been good to let the spacers cure before doing the acrylic since 
some of them shifted around during installation. To hold the acrylic in place, 
I made an MDF piece slightly smaller than the acrylic with plywood blocking 
screwed into it every 10". I clamped a 2x4 to the stanchions and with more 
plywood blocks, screwed everything together to apply the curvature to the 
acrylic and provide even pressure across the whole thing. I let the 795 cure 
for 10 days or so since it is very slow. 

My other worry with the acrylic was that an edge flaw could cause crazing, so I 
ended up band sawing the shape within 1/8" of the original, trim routing it 
flush with the original and then sanding from 80 up to 2000 grit to polish the 
edge. I also did a 1/8" chamfer on the outside since I thought it would look 
nice. 

They were installed this spring and have been great this summer. I think the 
real test will be surviving a Canadian winter and seeing how things look next 
fall. 

Derek McLeod 
1983 29-2, Aileron 
Toronto

> On Oct 21, 2015, at 10:13 PM, Gary Russell  wrote:
> 
> Fred.
>  Based on Don Casey's article, the 3M VHB tape is for adhesion and the 
> 795 DOW Corning silicone sealant is just for sealing.  No?
> Gary
> 
> ~~~_/)~~
> 
> 
>> On Wed, Oct 21, 2015 at 8:55 PM, Frederick G Street via CnC-List 
>>  wrote:
>> Based on the data, it sounds like VHB with LifeSeal would be a great 
>> combination (four times stronger than with Dow 795).  Has anyone tried that 
>> yet?  Or am I going to be the first guinea pig?   :^)
>> 
>> Fred Street -- Minneapolis
>> S/V Oceanis (1979 C Landfall 38) -- on the hard in Bayfield, WI   :^(
>> 
>>> On Oct 21, 2015, at 7:18 PM, Dennis C. via CnC-List  
>>> wrote:
>>> 
>>> LifeSeal is my "go to" sealant.  Haven't used 4200 (polyurethane) or 
>>> silicone in months. 
>>> 
>>> Dennis C.
>> 
>> 
>> ___
>> 
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>> of page at:
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>> 
>> 
> 
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Re: Stus-List Strengths of Various Adhesives

2015-10-22 Thread bobmor99 . via CnC-List 
Where's butyl?
(There's a roll in my refrigerator.)
I guess butyl's more of a sealant than an adhesive.
Not sure about that terminology, though.

--Bob M
Ox 33-1
Jax, FL

On Wed, Oct 21, 2015 at 4:40 PM, Dennis C. via CnC-List <
cnc-list@cnc-list.com> wrote:

> I did a bit of quick research on adhesives.  My quick look and the
> terminology may lead to inaccuracies.  I am not a materials engineer.  For
> instance, shear strength numbers were either listed as shear strength or
> lap shear strength, then there is dynamic vs static whatever.  Please take
> the info with a LARGE grain of salt.
>
> I listed the references so you can look them up yourself.
>
> This may interest some.
>
> Material
>
> Static or Lap Shear strength, psi
>
> Tensile strength, psi
>
> Reference
>
>
>
>
>
>
>
>
>
> Plexus MA530
>
> 1600-2200
>
> 3000-3500
>
>
> http://www.rshughes.com/p/Plexus-MA530-Black-Methacrylate-Adhesive-50-Gal-Drum-Shear-Strength-1600-To-2200-Psi-Tensile-Strength-3000-To-3500-Psi/plexus_it206/
>
> Sika
>
> n/a
>
> 160
>
> https://www.google.com/search?q=sika+295uv+shear+strength=utf-8=utf-8
>
> 3M 5200
>
> 360 (fiberglass)
>
> 630-705
>
>
> http://multimedia.3m.com/mws/media/158782O/adhesive-sealant-5200-tech-data.pdf
>
> 3M 4200
>
> 20-165
>
> 180
>
>
> http://multimedia.3m.com/mws/media/891179O/3m-marine-fast-cure-general-purpose-adhesive-sealant-4200fc.pdf
>
> LifeSeal
>
> 240
>
> 290
>
>
> http://www.boatlife.com/content/NEED%20LifeSealR%20POLYURETHANE-SILICONE%20SEALANT.pdf
>
> 3M VHB tape 59XX
>
> 1000
>
> 90-100
>
> https://multimedia.3m.com/mws/media/67100O/3mtm-vhb-tapes.pdf
>
> Dennis C.
>
> ___
>
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> bottom of page at:
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>
>
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Re: Stus-List Strengths of Various Adhesives mostly concerning portlights/windows

2015-10-22 Thread Tom Lynch via CnC-List 
My head is ready to explode!☺

One of you guru / experts ought to write a book on very subject!

On Thu, Oct 22, 2015 at 10:17 AM, Dennis C. via CnC-List <
cnc-list@cnc-list.com> wrote:

> Nice job, Derek.
>
> Let me add to your post.
>
> When I installed new ports in a 26 footer  (non C) couple weeks ago I
> had similar thoughts and concerns.
>
> I dry fiitted ports in place and held them with tape.  I then traced the
> outline of the inside of ports on the protective film and removed film from
> adhering surfaces.  Then took them to local glass shop where they applied a
> special black paint on the adhering surfaces.  Don't know any details on
> the paint but they said it actually improved adhesion.  It was matte and
> slightly rough.  With the paint, I didn't have to worry about bubbles or
> gaps in the sealant showing through.
>
> After taping the outside of the port landings and the inside of the ports,
> I applied a generous bead of black LifeSeal and installed the ports flush
> wiith the cabin sides.  I had several pieces of wood furring or filler
> strips precut.  I placed the strips against the ports and clamped them to
> the lifelines with clamps to hold pressure on the ports.
>
> Note:  the key here is to apply one large bead of sealant.  If you apply
> two adjacent beads, you may trap air between the beads which will show if
> you don't do the paint.
>
> While the sealant was still fresh, I ran the backside of a plastic spoon
> around the gap between the port lens and cabin side to create a nice
> concave look.  Note: run the spoon in ONE direction only.
>
> I didn't use any spacers.  Just made sure the lens was uniformly flush
> with the cabin side and that I got lots of "squeeze out" around the gap.
>
> Next day I removed strips and tape.  Any stray sealant was removed with a
> pencil eraser.  Didn't want to use an adhesive remover for fear of damaging
> the concave seal.
>
> Done.  Nice job.  Pat on back.
>
> Furring or filler strips are about 1.5 inches wide x 1/4 inch thick and
> can be bought in 8 foot lengths at a big box store for about $1 each.  The
> clamps were the 4 inch pony spring clamps that are about $4.
>
> Dennis C.
> Touche' 35-1 #83
> Mandeville, LA
>
>
>
> ___
>
> Email address:
> CnC-List@cnc-list.com
> To change your list preferences, including unsubscribing -- go to the
> bottom of page at:
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>
>
>
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Re: Stus-List Strengths of Various Adhesives

2015-10-21 Thread Frederick G Street via CnC-List 
From this, it sure looks like Plexus is the best structural option; 5200 would 
be next, but it’s not compatible with acrylic.  I’m surprised that LifeSeal 
shows such good characteristics.  VHB tape, 4200 and Sika are all in about the 
same range.  Looking at a cut sheet for Dow 795 (which you didn’t include here, 
but has been used with VHB tape), it’s not really providing much in the way of 
strength, with a >21 days cure tension adhesion strength of 45psi.

I thought the Dow 795 had greater structural characteristics than the cut sheet 
shows: http://www.dowcorning.com/DataFiles/090276fe801a7bbe.pdf

— Fred

Fred Street -- Minneapolis
S/V Oceanis (1979 C Landfall 38) -- on the hard in Bayfield, WI   :^(

> On Oct 21, 2015, at 3:40 PM, Dennis C. via CnC-List  
> wrote:
> 
> I did a bit of quick research on adhesives.  My quick look and the 
> terminology may lead to inaccuracies.  I am not a materials engineer.  For 
> instance, shear strength numbers were either listed as shear strength or lap 
> shear strength, then there is dynamic vs static whatever.  Please take the 
> info with a LARGE grain of salt.
> 
> I listed the references so you can look them up yourself.
> 
> This may interest some.
> 
> Material
> 
> Static or Lap Shear strength, psi
> 
> Tensile strength, psi
> 
> Reference
> 
>  
>  
>  
>  
> Plexus MA530
> 
> 1600-2200
> 
> 3000-3500
> 
> http://www.rshughes.com/p/Plexus-MA530-Black-Methacrylate-Adhesive-50-Gal-Drum-Shear-Strength-1600-To-2200-Psi-Tensile-Strength-3000-To-3500-Psi/plexus_it206/
>  
> 
> Sika 
> 
> n/a
> 
> 160
> 
> https://www.google.com/search?q=sika+295uv+shear+strength=utf-8=utf-8 
> 
> 3M 5200
> 
> 360 (fiberglass)
> 
> 630-705
> 
> http://multimedia.3m.com/mws/media/158782O/adhesive-sealant-5200-tech-data.pdf
>  
> 
> 3M 4200
> 
> 20-165
> 
> 180
> 
> http://multimedia.3m.com/mws/media/891179O/3m-marine-fast-cure-general-purpose-adhesive-sealant-4200fc.pdf
>  
> 
> LifeSeal
> 
> 240
> 
> 290
> 
> http://www.boatlife.com/content/NEED%20LifeSealR%20POLYURETHANE-SILICONE%20SEALANT.pdf
>  
> 
> 3M VHB tape 59XX
> 
> 1000
> 
> 90-100
> 
> https://multimedia.3m.com/mws/media/67100O/3mtm-vhb-tapes.pdf 
> 
> Dennis C.

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Re: Stus-List Strengths of Various Adhesives

2015-10-21 Thread Robert Boyer via CnC-List 
Remember that VHB tape is typically used on outdoor signs--it is not meant for 
any structural purpose.

Flexibility is probably more important than strength for the adhesive..

Dow 795 is silicone.

Bob


On Oct 21, 2015, at 6:29 PM, Frederick G Street via CnC-List wrote:

> From this, it sure looks like Plexus is the best structural option; 5200 
> would be next, but it’s not compatible with acrylic.  I’m surprised that 
> LifeSeal shows such good characteristics.  VHB tape, 4200 and Sika are all in 
> about the same range.  Looking at a cut sheet for Dow 795 (which you didn’t 
> include here, but has been used with VHB tape), it’s not really providing 
> much in the way of strength, with a >21 days cure tension adhesion strength 
> of 45psi.
> 
> I thought the Dow 795 had greater structural characteristics than the cut 
> sheet shows: http://www.dowcorning.com/DataFiles/090276fe801a7bbe.pdf
> 
> — Fred
> 
> Fred Street -- Minneapolis
> S/V Oceanis (1979 C Landfall 38) -- on the hard in Bayfield, WI   :^(
> 
>> On Oct 21, 2015, at 3:40 PM, Dennis C. via CnC-List  
>> wrote:
>> 
>> I did a bit of quick research on adhesives.  My quick look and the 
>> terminology may lead to inaccuracies.  I am not a materials engineer.  For 
>> instance, shear strength numbers were either listed as shear strength or lap 
>> shear strength, then there is dynamic vs static whatever.  Please take the 
>> info with a LARGE grain of salt.
>> 
>> I listed the references so you can look them up yourself.
>> 
>> This may interest some.
>> 
>> Material
>> 
>> Static or Lap Shear strength, psi
>> 
>> Tensile strength, psi
>> 
>> Reference
>> 
>>  
>>  
>>  
>>  
>> Plexus MA530
>> 
>> 1600-2200
>> 
>> 3000-3500
>> 
>> http://www.rshughes.com/p/Plexus-MA530-Black-Methacrylate-Adhesive-50-Gal-Drum-Shear-Strength-1600-To-2200-Psi-Tensile-Strength-3000-To-3500-Psi/plexus_it206/
>> 
>> Sika 
>> 
>> n/a
>> 
>> 160
>> 
>> https://www.google.com/search?q=sika+295uv+shear+strength=utf-8=utf-8
>> 
>> 3M 5200
>> 
>> 360 (fiberglass)
>> 
>> 630-705
>> 
>> http://multimedia.3m.com/mws/media/158782O/adhesive-sealant-5200-tech-data.pdf
>> 
>> 3M 4200
>> 
>> 20-165
>> 
>> 180
>> 
>> http://multimedia.3m.com/mws/media/891179O/3m-marine-fast-cure-general-purpose-adhesive-sealant-4200fc.pdf
>> 
>> LifeSeal
>> 
>> 240
>> 
>> 290
>> 
>> http://www.boatlife.com/content/NEED%20LifeSealR%20POLYURETHANE-SILICONE%20SEALANT.pdf
>> 
>> 3M VHB tape 59XX
>> 
>> 1000
>> 
>> 90-100
>> 
>> https://multimedia.3m.com/mws/media/67100O/3mtm-vhb-tapes.pdf
>> 
>> 
>> Dennis C.
> 
> ___
> 
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> of page at:
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Bob Boyer
S/V Rainy Days (1983 C Landfall 38 - Hull #230)
email: dainyr...@icloud.com
blog: dainyrays.blogspot.com

"There is nothing--absolutely nothing--half so much worth doing as simply 
messing about in boats." --Kenneth Grahame

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Re: Stus-List Strengths of Various Adhesives

2015-10-21 Thread Gary Russell via CnC-List 
Fred.
 Based on Don Casey's article, the 3M VHB tape is for adhesion and the
795 DOW Corning silicone sealant is just for sealing.  No?
Gary

~~~_/)~~


On Wed, Oct 21, 2015 at 8:55 PM, Frederick G Street via CnC-List <
cnc-list@cnc-list.com> wrote:

> Based on the data, it sounds like VHB with LifeSeal would be a great
> combination (four times stronger than with Dow 795).  Has anyone tried that
> yet?  Or am I going to be the first guinea pig?   :^)
>
> Fred Street -- Minneapolis
> S/V Oceanis (1979 C Landfall 38) -- on the hard in Bayfield, WI   :^(
>
> On Oct 21, 2015, at 7:18 PM, Dennis C. via CnC-List 
> wrote:
>
> LifeSeal is my "go to" sealant.  Haven't used 4200 (polyurethane) or
> silicone in months.
>
> Dennis C.
>
>
>
> ___
>
> Email address:
> CnC-List@cnc-list.com
> To change your list preferences, including unsubscribing -- go to the
> bottom of page at:
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>
>
>
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Re: Stus-List Strengths of Various Adhesives

2015-10-21 Thread Frederick G Street via CnC-List 
Based on the data, it sounds like VHB with LifeSeal would be a great 
combination (four times stronger than with Dow 795).  Has anyone tried that 
yet?  Or am I going to be the first guinea pig?   :^)

Fred Street -- Minneapolis
S/V Oceanis (1979 C Landfall 38) -- on the hard in Bayfield, WI   :^(

> On Oct 21, 2015, at 7:18 PM, Dennis C. via CnC-List  
> wrote:
> 
> LifeSeal is my "go to" sealant.  Haven't used 4200 (polyurethane) or silicone 
> in months. 
> 
> Dennis C.

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Re: Stus-List Strengths of Various Adhesives

2015-10-21 Thread Dennis C. via CnC-List 
LifeSeal is my "go to" sealant.  Haven't used 4200 (polyurethane) or
silicone in months.

Dennis C.

On Wed, Oct 21, 2015 at 5:29 PM, Frederick G Street via CnC-List <
cnc-list@cnc-list.com> wrote:

> From this, it sure looks like Plexus is the best structural option; 5200
> *would* be next, but it’s not compatible with acrylic.  I’m surprised
> that LifeSeal shows such good characteristics.  VHB tape, 4200 and Sika are
> all in about the same range.  Looking at a cut sheet for Dow 795 (which you
> didn’t include here, but has been used with VHB tape), it’s not really
> providing much in the way of strength, with a >21 days cure tension
> adhesion strength of 45psi.
>
> I thought the Dow 795 had greater structural characteristics than the cut
> sheet shows: http://www.dowcorning.com/DataFiles/090276fe801a7bbe.pdf
>
> — Fred
>
> Fred Street -- Minneapolis
> S/V Oceanis (1979 C Landfall 38) -- on the hard in Bayfield, WI   :^(
>
> On Oct 21, 2015, at 3:40 PM, Dennis C. via CnC-List 
> wrote:
>
> I did a bit of quick research on adhesives.  My quick look and the
> terminology may lead to inaccuracies.  I am not a materials engineer.  For
> instance, shear strength numbers were either listed as shear strength or
> lap shear strength, then there is dynamic vs static whatever.  Please take
> the info with a LARGE grain of salt.
>
> I listed the references so you can look them up yourself.
>
> This may interest some.
>
> Material
>
> Static or Lap Shear strength, psi
>
> Tensile strength, psi
>
> Reference
>
>
>
>
>
> Plexus MA530
>
> 1600-2200
>
> 3000-3500
>
>
> http://www.rshughes.com/p/Plexus-MA530-Black-Methacrylate-Adhesive-50-Gal-Drum-Shear-Strength-1600-To-2200-Psi-Tensile-Strength-3000-To-3500-Psi/plexus_it206/
>
> Sika
>
> n/a
>
> 160
>
> https://www.google.com/search?q=sika+295uv+shear+strength=utf-8=utf-8
>
> 3M 5200
>
> 360 (fiberglass)
>
> 630-705
>
>
> http://multimedia.3m.com/mws/media/158782O/adhesive-sealant-5200-tech-data.pdf
>
> 3M 4200
>
> 20-165
>
> 180
>
>
> http://multimedia.3m.com/mws/media/891179O/3m-marine-fast-cure-general-purpose-adhesive-sealant-4200fc.pdf
>
> LifeSeal
>
> 240
>
> 290
>
>
> http://www.boatlife.com/content/NEED%20LifeSealR%20POLYURETHANE-SILICONE%20SEALANT.pdf
>
> 3M VHB tape 59XX
>
> 1000
>
> 90-100
>
> https://multimedia.3m.com/mws/media/67100O/3mtm-vhb-tapes.pdf
>
> Dennis C.
>
>
>
> ___
>
> Email address:
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> bottom of page at:
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>
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Re: Stus-List Strengths of Various Adhesives

2015-10-21 Thread Jack Brennan via CnC-List 
Just curious about people’s opinions of various non-marine adhesive sealants 
that have come on the market in recent years. I’ve used this one to seal 
portlights in metal frames (not on a C) and a couple of deck fittings with 
great results.

http://www.homedepot.com/p/DAP-3-Crystal-Clear-Window-Door-Trim-and-Siding-Sealant-18362/202337643

Frankly, I’ve found it much better than the marine sealants, which always seem 
to degrade after a year or so. This stuff forms a nice, pliable gasket and 
sticks like 4200. Better yet, it dries in 30 minutes, so you don’t have to deal 
with the uncertainty of taping a portlight or fitting and hoping it doesn’t 
shift.

Jack Brennan
Former C 25
Shanachie, 1974 Bristol 30
Tierra Verde, Fl.

From: Gary Russell via CnC-List
Sent: Wednesday, October 21, 2015 10:13 PM
To: C List
Cc: Gary Russell
Subject: Re: Stus-List Strengths of Various Adhesives

Fred.
 Based on Don Casey's article, the 3M VHB tape is for adhesion and the 795 
DOW Corning silicone sealant is just for sealing.  No?
Gary

~~~_/)~~



On Wed, Oct 21, 2015 at 8:55 PM, Frederick G Street via CnC-List 
<cnc-list@cnc-list.com> wrote:

  Based on the data, it sounds like VHB with LifeSeal would be a great 
combination (four times stronger than with Dow 795).  Has anyone tried that 
yet?  Or am I going to be the first guinea pig?   :^)


  Fred Street -- Minneapolis
  S/V Oceanis (1979 C Landfall 38) -- on the hard in Bayfield, WI   :^(


On Oct 21, 2015, at 7:18 PM, Dennis C. via CnC-List <cnc-list@cnc-list.com> 
wrote:

LifeSeal is my "go to" sealant.  Haven't used 4200 (polyurethane) or 
silicone in months.


Dennis C.



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Re: Stus-List Strengths of Various Adhesives

2015-10-21 Thread svpegasus38 






The VHB tape supplies the structural strength, while the Dow 795 is the 
sealant. At least that is the information I was able to get. 
Doug MountjoysvPegasusLF38 just west of Ballard, WA.




-- Original message--From: Frederick G Street via CnC-ListDate: Wed, 
Oct 21, 2015 15:29To: cnc-list@cnc-list.com;Cc: Frederick G Street;Subject:Re: 
Stus-List Strengths of Various Adhesives
>From this, it sure looks like Plexus is the best structural option; 5200 would 
>be next, but it’s not compatible with acrylic.  I’m surprised that LifeSeal 
>shows such good characteristics.  VHB tape, 4200 and Sika are all in about the 
>same range.  Looking at a cut sheet for Dow 795 (which you didn’t include 
>here, but has been used with VHB tape), it’s not really providing much in the 
>way of strength, with a >21 days cure tension adhesion strength of 45psi.
I thought the Dow 795 had greater structural characteristics than the cut sheet 
shows: http://www.dowcorning.com/DataFiles/090276fe801a7bbe.pdf

— Fred

Fred Street -- Minneapolis
S/V Oceanis (1979 C Landfall 38) -- on the hard in Bayfield, WI   :^(
On Oct 21, 2015, at 3:40 PM, Dennis C. via CnC-List  
wrote:
I did a bit of quick research on adhesives.  My quick look and the terminology 
may lead to inaccuracies.  I am not a materials engineer.  For instance, shear 
strength numbers were either listed as shear strength or lap shear strength, 
then there is dynamic vs static whatever.  Please take the info with a LARGE 
grain of salt.

I listed the references so you can look them up yourself.

This may interest some.

MaterialStatic or Lap Shear strength, psiTensile strength, psiReference 
 
 
 
Plexus 
MA5301600-22003000-3500http://www.rshughes.com/p/Plexus-MA530-Black-Methacrylate-Adhesive-50-Gal-Drum-Shear-Strength-1600-To-2200-Psi-Tensile-Strength-3000-To-3500-Psi/plexus_it206/Sika
 
n/a160https://www.google.com/search?q=sika+295uv+shear+strength=utf-8=utf-83M
 5200360 
(fiberglass)630-705http://multimedia.3m.com/mws/media/158782O/adhesive-sealant-5200-tech-data.pdf3M
 
420020-165180http://multimedia.3m.com/mws/media/891179O/3m-marine-fast-cure-general-purpose-adhesive-sealant-4200fc.pdfLifeSeal240290http://www.boatlife.com/content/NEED%20LifeSealR%20POLYURETHANE-SILICONE%20SEALANT.pdf3M
 VHB tape 
59XX100090-100https://multimedia.3m.com/mws/media/67100O/3mtm-vhb-tapes.pdf
Dennis C.


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