One thing I noticed in these specs is that the VHB tapes have generally better
strength of bond when a dynamic load is applied and “will tend to show creep
behaviour with stress load acting over a long period of time (static pressure).
As a general rule, for static loads, approximately four square inches of tape
should be used for each pound of weight to be supported in order to prevent
excessive creep.”
I am not sure, but it seems to me that for bonding windows to the cabin top,
this might be an issue if the windows are curved. Curved windows would try to
detach themselves from the fibreglass to which they are attached. So unless you
have some other way of keeping them curved, the tape might not be the best
option.
just a thought.
Marek
From: Josh Muckley via CnC-List
Sent: Tuesday, November 10, 2015 10:48 AM
To: C&C List
Cc: Josh Muckley
Subject: Re: Stus-List Fwd: Replacing Windows
The attached PDF had pretty good guidance. I would choose the thickest tape
which can still fit under the windows. Maybe even double layers. I have a
friend who used the 4941 series. After looking at the PDF it looks like the
5952 series has better adhesive qualities and possibly higher adhesion for the
fiberglass and polycarbonate that we're using. The 5958FR has the highest PSI
to thickness ratio. I suggest thicker to allow the tape to press into any
irregularities. Thicker also allows for more differential expansion of the
glass and frame.
As much as I like the VHB tape I still can't help but think to the auto
industry. They use a urethane made by Sika for windshields. It has to be
primed and heated. It cures in about an hour. I wonder if a combination of
VHB tape and sika-flex might be smart. VHB to get a nice interior finish and
sika for a permanent weatherproof bond and glazing.
Josh Muckley
S/V Sea Hawk
1989 C&C 37+
Solomons, MD
On Nov 10, 2015 9:54 AM, "Gary Russell via CnC-List" <cnc-list@cnc-list.com>
wrote:
Rob,
Yikes! Thanks for the info. How to choose?
Gary
~~~~~~~_/)~~~~~~
On Tue, Nov 10, 2015 at 9:33 AM, robert via CnC-List <cnc-list@cnc-list.com>
wrote:
Dave:
I am no VHB expert.....have never used the stuff. I understand there are
many different versions, at least that what I get from the website below.
http://multimedia.3m.com/mws/media/67100O/3mtm-vhb-tapes.pdf
Point being, make sure you get the right tape for the job you intend to use
it.
Rob Abbott
AZURA
C&C 32 - 84
Halifax, N.S.
On 2015-11-09 8:40 PM, Dave Godwin via CnC-List wrote:
More response to this thread; I’ve been working on the fixed ports on my
boat over the last few days and and paying close attention. After absorbing a
good bit of the info in the thread and the links provided, I’m planning on
moving away from using Plexus ("if it was good enough for my grandfather it’s
good enough for me!”) and using the 3M tape. Seems the more modern ticket to
me.
I’m anticipating the operation to be a good bit easy than using Plexus,
certainly if it is just one person doing the job.
Cheers,
Dave Godwin
1982 C&C 37 - Ronin
Reedville - Chesapeake Bay
Ronin’s Overdue Refit
On Nov 9, 2015, at 11:56 AM, Dennis C. via CnC-List
<cnc-list@cnc-list.com> wrote:
Was afraid of that. The only ports close to the new C&C ports I've
done were on a Beneteau. Don't remember how hard the adhesive was.
Dennis C.
On Mon, Nov 9, 2015 at 10:45 AM, Gary Russell via CnC-List
<cnc-list@cnc-list.com> wrote:
Hi Dennis,
I'm quite sure those blades would work well for soft calk like
silicones or urethanes, but Plexus is hard as a rock and I don't think they
would work. In addition, the big problem is getting at the bottom window joint
that is very close to the turn on the deck.
Gary
S/V High Maintenance (formerly Expresso)
1990 C&C 37 Plus
East Greenwich, RI, USA
~~~~~~~_/)~~~~~~
On Mon, Nov 9, 2015 at 11:25 AM, Dennis C. via CnC-List
<cnc-list@cnc-list.com> wrote:
Not quite the same thing but lately I've been removing ports that
were held in with sealant by using a vibrating saw with a caulk cutting blade.
Like these:
http://www.amazon.com/Bosch-OSC214C-4-Inch-Caulk-Knife/dp/B004UBF43S
http://multifitblades.com/straight-sealant-cutter.html
Not sure how they would work on Plexus or Sika adhesives.
Dennis C.
Touche' 35-1 #83
Mandeville, LA
On Mon, Nov 9, 2015 at 9:30 AM, mike amirault via CnC-List
<cnc-list@cnc-list.com> wrote:
"Wow! You guys are lucky! My Windows came out in pieces with significant gel
coat damage."Well, Gary, you are "High Maintenance" ;)Mike AmiraultLovely
Cruise C&C33MKiiSMSC
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