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Catalina/Capri 25/250 Sailor's Forums

General Sailing Forum

Prepping the hull for barrier coat/paint

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Douglas
Master Marine Consultant

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1595 Posts

Initially Posted - 02/28/2002 : 18:29:55

Here are a few pics of the hull and keel. Note the fairing compound used by Catalina. Several small blisters that need refilling. Im using a Industrial Makita orbital 8 hole sander. Removed the dust bag and hooked up to a five h.p. vac. Double bag inside the vac to contain the dust. 60 to 80 grit sanding paper to strip the bottom paint. 100 grit to smooth everything down. To hulls come next.<img src="http://im1.shutterfly.com/procserv/47b2dc09b3127cce9c9a3ea56d900000005410" border=0><img src="http://im1.shutterfly.com/procserv/47b2dc09b3127cce9c9a3ea36d960000005410" border=0><img src="http://im1.shutterfly.com/procserv/47b2dc09b3127cce9c9a3ea0eca50000005410" border=0><img src="http://im1.shutterfly.com/procserv/47b2dc09b3127cce9c9a3ea16d940000004410" border=0>

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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts

Response Posted - 02/28/2002 : 18:44:34

Did your hull have a barrier coat on it before you started sanding? The antifouling paint on my Cat 25 that I recently purchased is in terrible shape and needs to be removed. Where the paint is chipping off, I can see what looks to be a blackish barrier coat of some kind(VCTar?). My question is, how do I go about removing the antifouling paint? Do I want to remove the barrier coat too or just the antifouling? How do I remove just the antifouling? sanding? scraping?

Don & Jennifer, Northstar
C25 SR/FK

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Douglas
Master Marine Consultant

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1595 Posts

Response Posted - 02/28/2002 : 19:05:54

My boat had anti fowling paint several coats. Under that was a blue gel coat that was done for the large boot stripe. Over that was a white gel coat. In a few places I sanded through the white gel coat and got a dark blue then glass. You can just make out the layers where I have cleaned out the blisters. There was no barrier coat. My intention is to go back on with 6 to 8 mils of thick none blushing epoxy barrier coat then anti foweling paint. To remove the anti foweling paint I just sanded with 60 and 80 grit paper on the 5" orbital. Thats why I have the vacume attached. It sucks up all the dust. Once I got most of the heavy stuff off I switched to 80 or 100 grit. Its a loon tedious job but Ill know it was done right.

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Jeff
1st Mate

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37 Posts

Response Posted - 03/01/2002 : 02:18:45

I've always been able to prep for bottom paint just by sanding w/ 80 grit paper on a 1/3 sheet orbital sander. But I've never faced a really thick layer of bottom paint. Practical Sailor did a piece on this subject and came out in favor of chemical paint peelers. Their best buy recommendation was a non-marine product available from hardware stores called Peel-Away. It's available from the local Ace Hardware store. Not having used it myself I can't provide 1st hand knowledge, but PS liked it.

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Steve Raffel
Captain

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262 Posts

Response Posted - 03/01/2002 : 08:22:09

If you use Peel Away, try a small area. A friend of mine did his boat and had a terrible experience. It may be a great product, but then again it might be the source of countless hours of work.

Steve Raffel
C 250 WK #408

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OJ
Master Marine Consultant

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USA
4382 Posts

Response Posted - 03/01/2002 : 09:01:14

The strength of Peel Away is that it can remove several layers of paint in one application. Its weakness is dealing with one big gooey mess when you are done.

Steve Madsen
#2428
OJ(Ode to Joy)

[url="http://catalina25-250.org/photo0.htm/"]<img src="http://www.catalina25-250.org/photo/ode075.jpg" border=0>[/url]

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Jeff
1st Mate

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37 Posts

Response Posted - 03/04/2002 : 00:45:18

Having only used sandpaper, and having dealt with the mess that comes from all the dust. (I don't have the nifty vacuum system described in the earlier post.) I wonder if the liquid - pasty - goopy mess a chemical stripper makes might actually entail less clean-up than paint dust that floats into and onto everything.

Anybody out there with experience using both?

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Douglas
Master Marine Consultant

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1595 Posts

Response Posted - 03/04/2002 : 01:32:07

Im not having any trouble with dust when sanding the bottom. Im using an 8 hole orbital sander attached to a 5 hp shop vac. Inside the shop vac is a double bag. So far the Vac has picked up just about all the dust and debris. I was plesantly surprised at how well it works. Its a requirement of the boat yard Im at. I havent even gotten myseld dirty. We will see how well it goes putting barrier coat and paint back on.

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Jeff
1st Mate

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37 Posts

Response Posted - 03/04/2002 : 02:44:09

Is it your sander/vacuum system or is it the yard's? If you don't mind, how much $ ?

Sounds like a great set-up.

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OJ
Master Marine Consultant

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USA
4382 Posts

Response Posted - 03/04/2002 : 10:26:21

I don't know about this double-bag method - not getting yourself dirty would seem to take a lot of the fun out of it <img src=icon_smile_wink.gif border=0 align=middle>.
Douglas, how many blisters did you discover? I stopped counting after 300 with OJ.

Steve Madsen
#2428
OJ(Ode to Joy)

[url="http://catalina25-250.org/photo0.htm/"]<img src="http://www.catalina25-250.org/photo/ode075.jpg" border=0>[/url]

Edited by - OJ on 03/06/2002 10:26:26

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Douglas
Master Marine Consultant

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1595 Posts

Response Posted - 03/04/2002 : 15:47:06

The double bag inside the vacume is an EPA requirment in the boat yard. I just emptied the inner bad this AM before heading to the yard. It has about 2 to 3 pounds of dust in it. Blisters found so far is about 20. All small fingernail size and mostly just gel coat. Im about 2/3 done sanding the hull. Should be able to fill and fair in a day or two. If it rains Ill switch to working onside the boat grinding off the to hulls. Ill post a few more pics tonight.

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n/a
deleted

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163 Posts

Response Posted - 03/04/2002 : 16:50:07

Please be aware that the Peel-away residue may qualify as and require disposal as hazarous waste. See if you have a free, houshold haz waste disposal day in your area and take it to that.

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Ben - FL
Admiral

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880 Posts

Response Posted - 03/04/2002 : 22:01:49

I wouldn't worry about the getting dirty part. But breathing in anti-fouling paint dust would surely be something to avoid at all cost. I'm glad your using the vacuum. EPA is one thing. OSHA is the other.
FYI, OSHA does a lot of educational training about their regulations. EPA does none, and they do not negotiate penalties like OSHA does.

Safe voyages,
Ben, FL s/v Chick-a-pea C250wk

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Douglas
Master Marine Consultant

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1595 Posts

Response Posted - 03/04/2002 : 22:37:06

Progress made today on the port side. BTW I use a resperator / gloves and protective clothing as well as eye protection. Soooo here is how it looks so far.<img src="http://im1.shutterfly.com/procserv/47b2dd25b3127cce9c8cfe7717820000004410" border=0><img src="http://im1.shutterfly.com/procserv/47b2dd25b3127cce9c8cfe7317860000005410" border=0>

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Jeff
1st Mate

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37 Posts

Response Posted - 03/04/2002 : 23:37:49

Looks great! How about a picture of your sander w/ vacuum attachment. And some specs like brand and price?

For the posts about the requirement for hazardous disposal of Peel Away - Just a guess, but I bet EPA is more concerned w/ what's in anti-fouling paint dust than they are with what's in paint remover. Either way you are dealing with responsible disposal of hazardous wastes.

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Douglas
Master Marine Consultant

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1595 Posts

Response Posted - 03/05/2002 : 20:31:19

BTW I tried chemical stipers and in the cold dry weather they dry out to fast to do any good. They also soak into the bottom paint and it often takes 3 or 4 applications to get paint off./Then there is still paint left and I ended up having to sand anyway. Chem stip is in the end more work than streight sanding.

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