The
fiberglass expert that repaired my cat outstanding and who was instructing and supervising me on the Restauration of the hulls with vinylester recommends the follow:
1) on vinylester you don‘t need
osmosis protection but it’s good to have a separation barrier for whatever antifouling you put on. That’s also sealing any
mistakes you or whoever done something would have made where maybe
water could get through to
core (eg. Capilar effect), means that’s the point where you remove latest all your through-hulls then paint with 2) and install new ones before light primer.
2) he recommended and I used Hempel Majestic Thick epoxy primer 2 layers rolled on, first layer late afternoon, 2nd layer in the next morning without
sanding. That’s your separation and sealing barrier and no
water can penetrate that. Look at drying times in your location, the chemical bond between layers is stronger, you have more thickness and you save a lot time and
money not to sand inbetween.
3) on top of that without
sanding another 6h later 2 layers of light primer in different colors, that’s your antifouling primer and working surface primer means if you sand or blast your antifouling away and the yellow color comes through you know you are at the primer but some spots you need to even out so get to eg blue and know he need to stop soon. When the first spots of gray come out stop, that’s max even you get or have to stop blasting.
Instead Hempel light primer you can use what’s recommended as primer for the antifouling of your choice.
I used Coopercoat. be aware that Coopercoat is water based epoxy that let water slowly penetrate it. Coppercoat works by water dissolving the top 1/100mm layer of the epoxy to expose new copper and that layer by layer over the years. So you need a watertide epoxy barrier before applying it.
Know 2
boats where coppercoat was applied onto
new boat without a barrier coat and 6 years later both got
osmosis.
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