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AstroLancer · 02-10-2015, 05:55

I have just pick myself up a 1980 M27 racing cruiser that has been antifouled in the past but is now being kept on land. The top paint is looking pretty sub par despite its recent paint job and the bottom paint is not very attractive at all. From inspection on the inside, the bottom paint section shows a lot of light through the hull (fibreglass boat). So! I want to know if there is some special paint I should use for the bottom side (I don't want to antifoul as its stored on land) or is the same 2 part polyurethane paint that's used on the top side. Or any suggestions for other paint types? Looking for something gloss like gell.

Thanks for the help!

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motion30 · 02-10-2015, 07:39

Same paint as topside

AstroLancer · 02-10-2015, 07:40

Thanks!

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ramblinrod · 02-10-2015, 14:10

For under the waterline, I recommend using gelcoat.

If you wish to use paint, use a two part epoxy paint.

Before applying either, you will need to remove all traces of anti-fouling, typically by sanding.

Additionally, you should let the hull dry as long as possible before coating (6 months is not too long).

For gelcoat:

1. Seal any raw fibreglass (sanded with fibres showing) with a coat of polyester resin.

2. Spray at least 2 coats of gelcoat.

3. Sand with progressively finer sandpaper (300, 600, 1200) and then wax.

4. If osmosis protection is required, skip wax in step 3, and apply 4 coats of barrier coat (like Interlux Interprotect E2000).

For paint:

1. Apply a two part epoxy to any raw fibreglass (like Interlux Epiglass), to seal the fibres.

2. Apply 1 coat of primer (like Interlux Interprotect E2000).

3. If more osmosis protection is required/desired, apply 4 or more coats of barrier paint (like E2000).

4. Apply at least 2 coats of 2 part epoxy paint (like Interlux Perfection).

RamblinRod
www.sheenmarine.com