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  #1  
Old 03-23-2010
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Water based paint

I was considering painting the interior of my vessel with water-based paint to avoid the stinky fumes and cleanup with other stinky stuff. I've heard that this is a good solution but I'm leery; I've painted aluminum hulled oceangoing vessels with waterbased paint and it worked well, I don't know how well it would stick to gelcoat.

Is this a good idea, would I be better off to just use oil-based marine paint? If anyone else has done this, how did you prep the gelcoat?

Any advice would be most welcome, thanks in advance!
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Old 03-23-2010
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sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
Should stick just fine if you PREP the interior properly. The number one reason for paint jobs failing is bad prep. 95% of the work in a good paint job is surface prep.
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Old 03-23-2010
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You can paint with a water based paint but there are a few things to consider, adhesion is going to be your biggest problem. You need to use a water based primer which sticks aggressively to above the waterline fiber glass and gelcoat. XIM UMA (urethane modified acrylic) fits the bill. It is water based and has great adhesion. Down side is that UMA is a little soft unless you get the latest version direct from XIM. You can topcoat UMA with any latex, urethane, or epoxy topcoat. You can find UMA at ximbonder on the internet.
Procedure is to scuff sand gelcoat and wipe with solvent or clean well with non-residue soap cleaner. Critical in that you do not use a cleaner that leaves a film residue. Apply UMA, it is ready to repaint in an hour at 70 degrees, 50% humidty. UMA takes about a week to full cure, after that time it is pretty near impossible to scrape off.

PS- I have no interest in XIM, just used their products from time to time and have been happy with the results.
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Old 03-23-2010
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SD is correct. We painted the interior of our old boat, a 1976 Cal 2-29 and had good success by doing a proper prep and using "Kilz" as a base/ primer coat. The results were very satisfactory and I understand still looking good after 10+ years. Don Casey's book "This Old Boat" has some good information on the subject.

FWIW...
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BTW, if you're painting the bilge, don't use paint, use barrier coat. Most paints are not designed to be in wet environments like a bilge, barrier coat is.
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Old 03-24-2010
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Be Careful

I can't offer sugguestions, but will offer a caution that what I suspect is PO latex used in the wrong place,
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