Re: Stus-List Bottom paint removal

Wed, 16 Apr 2014 07:16:32 -0700


I'm not looking to remove everything - I believe the boat currently has an ablative coating, I just want to clean off some of the loose areas, and make it ready for a new layer.  On my Mirage 24 I would do a quick sanding with ~80-120 grit paper on the RO sander -- I did the whole bottom in less than 2 hrs.  Then rolled on the new bottom coat the next morning and dropped her in the water.

Maybe I'm overdoing the annual bottom maintenance?  Mention of the "Doodle bug" - online search I see it is a pole sander.  I thought I needed to clean things off more than that?  Mind you my history is painting houses to get through school - not all that applicable to boat bottoms!

Any suggestions from the list on which bottom coating?
I put on Interlux Bottomkote XXX last year -- seemed to do pretty well - never had anyone touch the hull all summer and only had minor growth in the fall.  Tempted to bump up this year to one of the "better" options, but really no idea other than price.

INTERLUX FIBERGLASS BOTTOMKOTE ACT - GALLON      -- $193/G
NTERLUX FIBERGLASS BOTTOMKOTE - GALLON            -- $162/G
INTERLUX BOTTOMKOTE XXX ANTIFOULING - GALLON    -- $112/G
PETTIT HORIZON ABLATIVE BLUE GALLON                    --$180/G

(Readily avail here at the Binnacle)

Mark

There is no cure for birth and death save to enjoy the interval.
  - George Santayana
On 16/04/2014 9:29 AM, Hoyt, Mike wrote:

The only reason for DIY with scraper over soda blasting in my mind is $$$$$.  I have done two boats so far each under 9 ft beam and 27.5 LOA.  Is a fairly large job. 

 

RO Sander is very slow if you have an epoxy barrier coat to deal with and when you do the aggressive grit of the sandpaper needed to remove the barrier coat may (read that WILL) damage the underlying gel coat.  I used paint scrapers with rounded edges but only after using a gas powered pressure washer to take off all the loose stuff (and any ablative paint).   Followed that with RO sander with 120 grit for final polish.  Of course once all this is complete you need to long board sand it to make the bottom smooth and undo any high or low spots caused by ROS.

 

Yeah.  I took 50 hours to do a bottom job on a J/27 which is 27.5 LOA and 8.5 beam.  This included complete strip, barrier coat application (only one layer) and then two coats AF paint (VC Offshore at the time).  My friends with the C&C 99 had their bottom soda blasted in three hours.  I paid less but hurt more

 

Mike

Nut Case

 

 

From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Andrew Burton
Sent: Tuesday, April 15, 2014 9:34 PM
To: cnc-list@cnc-list.com
Subject: Re: Stus-List Bottom paint removal

 

I have so far sanded half Peregrine's bottom with RO sanded and vac. Big job, but I bought a $150 mobile scaffold from Harbor Freight, which made the job a lot easier.

 

Andy

C&C 40

Peregrine

Andrew Burton

61 W Narragansett

Newport, RI 

USA    02840

 

http://sites.google.com/site/andrewburtonyachtservices/

+401 965-5260


On Apr 15, 2014, at 20:01, Chuck S <cscheaf...@comcast.net> wrote:

Agree.  Cleaned my 36 footer's bottom using the orbital sander w vacuum and it is a huge job.  I was in between job opportunities so low on cash w a lot of free time so I did the Interprotect barrier coat too.  Did the last bits using wet sandpaper and had a hose clamped on a ladder lightly spraying the hull to wash it away.  Nice method for me, but EPA doesn't approve. Swore I'd have it soda blasted next time.

 

Last year I changed my bottom paint from VC-Offshore to Micron 66 and priced sodablasting; $1650.   Couldn't justify that, so I wetsanded my hull using a doodle bug and 3M scuff pads and wetsandpaper.  Didn't take all the paint off, just scuffed it for a good mechanical bond.  

 

Bottom maintenance trick:  When I haul the boat, I follow the guy with the pressure washer and doodle bug the whole bottom while it is hanging in the slings.  He takes about 20 minutes and I take maybe 40, so the guys go to break or lunch while I finish scrubbing and rinse.  All the water and bottom paint falls into their paint containment system and gets filtered, meeting EPA regs.   The boat looks ready to launch all winter.

 

 

Chuck
Resolute
1990 C&C 34R
Atlantic City, NJ

 

From: "Gary Nylander" <gnylan...@atlanticbb.net>
To: cnc-list@cnc-list.com
Sent: Tuesday, April 15, 2014 2:46:02 PM
Subject: Re: Stus-List Bottom paint removal

 

Somehow, I just don't get it. A friend is having his Morris 36 stripped at the yard where my boat sits (in the water). They went through some peel away stuff, then some random orbital (air powered) and then again with some finer sandpaper. It has been a couple of weeks...... Last year they had the soda blasting folks come in and after about four hours, the bottom of a larger boat was as smooth as it came out of the mold. I just don't get it. I'll ask my friend what he was thinking tomorrow at lunch.... After going through that mess and brute labor a few years ago, I would never do it again, no matter how 'easy' the tool is - I just don't want to stoop under a boat holding any tool over my head, taking off toxic crap.

 

Gary

----- Original Message -----

Sent: Tuesday, April 15, 2014 2:02 PM

Subject: Re: Stus-List Bottom paint removal

 


I know sucking in the dust from scraping the bottom is not good - but in the past I've used a random orbital sander with a fairly rough grit paper (and a mask)
Seems to go pretty quickly, or at least it did on my little 24'

 

Are scrapers preferred?  I'd have thought the finish would be much rougher.

 

Mark

 

There is no cure for birth and death save to enjoy the interval.
  - George Santayana

On 15/04/2014 2:54 PM, PME wrote:

Hi,

 

Scraping off bottom paint is a pain with a cheap steel scraper.  Once has to nearly sharpen the blade ever other second.   This year I discover using a good tool really matters.    

 

Don't use a steel scraper, pay the $23 and get a tungsten carbide scraper.  One blade will last a whole side of the boat or more.  I was amazed.

 

Here is a link to a scraper I used on a 38LF.  Bahco 665 Carbide Edged Heavy-Duty Paint Scraper

 

 

 

 

-
Paul E.
1981 C&C 38 Landfall
S/V Johanna Rose
Carrabelle, FL



 

 

On Apr 15, 2014, at 10:55 AM, cnc-list-requ...@cnc-list.com wrote:

 

Message: 4
Date: Tue, 15 Apr 2014 00:29:43 -0300
From: Rich Knowles <r...@sailpower.ca>
To: cnc-list Cnc-List <cnc-list@cnc-list.com>
Subject: Stus-List Bottom paint removal
Message-ID: <2ef7ca9a-bfa1-4c91-9820-3dfea7c86...@sailpower.ca>
Content-Type: text/plain; charset=windows-1252

I got adventurous this year and decided to remove as much of the existing bottom paint as possible. There are many layers on the boat that have accumulated over time. Ordinary manual scrapers take a lot of time and energy, and sharpening. I developed this scraper which will fit in any reciprocating saw and uses a carbide blade. It is a lot easier and quicker and the blades last much longer than regular steel blades.

Here?s a video: https://www.youtube.com/watch?v=_2lsNuCrfgk

Now, all I have to do is get at it as soon as the rain stops for a few days and the temperature becomes bearable.

Rich Knowles
INDIGO LF38
Halifax, NS.


 



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