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post #11 of 15 Old 08-08-2014
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Re: Bottom paint

My boat looked similar to yours a month ago, I took keel off, sand blasted, epoxied, faired and painted it, sanded and painted the bottom, did not go through gelcoat. Heres a couple before and after photos.

Bottom paint-keel-before-sandblast.jpg

Bottom paint-starboard-keel-after-paint.jpg

Bottom paint-bottom-prior-paint.jpg

Bottom paint-keel-mounted.jpg
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post #12 of 15 Old 08-09-2014
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Re: Bottom paint

Originally Posted by ianjoub View Post
Should I put the outdoor oil based primer and top coat on top of the barrier coat, or instead of the barrier coat?
Barrier coats are for boats that spend a lot of time in the water. If you are not going to use antifouling paint because you intend to haul the boat after every use, then I would forego the barrier coat, given that the gel coat is in decent condition. Spend that money instead on something you actually use, like a new sail.
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post #13 of 15 Old 08-17-2014
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Re: Bottom paint

I purchased a new to me boat as well and the bottom looks very similar to the OP's. Is the best way to prep for new paint to sand the bottom and then paint? Also, what is the difference between barrier coat and bottom paint? Personally, I will be in for 6 months at a time in fresh water.
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post #14 of 15 Old 08-17-2014
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Re: Bottom paint

Cincy...There's a lot of information regarding this multi-step process on the Boat US Website:
There are also the paint manufacturers sites: like Petit and Interlux; take some time and check them out.

This is just one article: Boat Bottom Paint - BoatTECH - BoatUS

To briefly answer your question should sand the bottom to remove any peeling or chipping paint, but you want to be careful not to go so far that you damage the gel coat if it's still intact.

Barrier coat's goal is to keep moisture out, but it can also trap moisture in. So the hull should be clean and dry. Bottom paint is used to prevent marine growth, however it is not impervious and will allow moisture in. So, it's often desirable to barrier coat and then apply bottom paint. Then you maintain the bottom paint.

This is, of course a very simplified summary. The actual process and procedures will vary dependent upon how neglected your hull and keel are and if there are any blisters that need repair or any fairing that needs to be completed.

If doing the keel it's best to take it down to clean, solid, shiny metal, fill, fair, barrier coat and bottom paint.. if it looks like the OP's keel.

There are also many variations of bottom paint.

You might want to ask around your marina and see what others have success with.
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post #15 of 15 Old 08-17-2014
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Re: Bottom paint

Originally Posted by ianjoub View Post
Yes, I am not at a marina. I have the boat at my auto repair shop.

Should I put the outdoor oil based primer and top coat on top of the barrier coat, or instead of the barrier coat?

An epoxy barrier coat will do just fine on it's own.

Something like Sherwin Williamss Fast CladŽ Brush Grade Epoxy.
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