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Catalina/Capri 25/250 Sailor's Forums

General Sailing Forum

sealing holes in the bottom

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JimB517
Past Commodore

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USA
3285 Posts

Initially Posted - 05/26/2004 : 12:59:04

OK, so my new hard dinghy had been very abused. There were through hulls for a bait tank system, and other un identified holes, wounds, scrapes, and so on.

Here is what I did. I sprayed the larger holes with that spray foam insulation from Home Depot, with each side covered by tape. That made a new foam core. Each hole left about 1/2 inch of room for epoxy with the tape off. Larger holes also got wood plugs. This was then covered with Marine Tex on both sides. OK, those should be waterproof repairs.

The big wounds on the bottom, front and rear were sanded, ground,m then filled with a fiberglass strand and epoxy mixture sold at West Marine as Marine Fiberglass Filler. This stuff worked great and is very solid. It also says "water resistant" not "water proof".

What I would like to do now is sand those down and then cover these big repairs with Marine Tex for waterproofing. The paint the entire bottom with some type of waterproof epoxy. The stuff has to be thin and go on like paint. There are lots of little cracks and scrapes and flaws I would like to cover prior to painting the whole boat and then bottom paint below the water line.

Is there such stuff and what is recommended?

PS.

The dinghy will not be stored in the water. I would guess 3 to 4 weeks in the water per year.

Indiscipline 1978 FK SR #398

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John Mason
Admiral

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USA
687 Posts

Response Posted - 05/26/2004 : 14:47:01

If you "paint" the bottom with epoxy, you'll have to cover that with something else that's UV resistant. If it were mine I'd sand and fill the scrapes and scratches and then paint it with a polyurethane paint (two-part is best, but one-part works well also) and not do the full layer of epoxy.

3 to 4 weeks in the water per year, I wouldn't worry about bottom paint.

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Mark Maxwell
Captain

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USA
329 Posts

Response Posted - 05/26/2004 : 19:24:06

I just finished applying an epoxy barrier paint to my boat. I used a primer called CM 15. (It can also be used as a stand alone paint) It's thin so It has an excellent flow (I used a smooth finish foam roller from home depot) I think it will fit your needs perfectly go to this site http://www.epoxyproducts.com/4_epoxypaint.html and scroll down the page a little more than half way and you'll find CM 15 specs.

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The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.