1. I am confused with " bottom paint
" is it the original paint
'bottom paint' is antifouling. fiberglass
boats come out of the factory with gelcoat
as the outer layer. owners then apply 'bottom paint' to keep the hull
from getting fouled. there are two kinds - ablative and hard. ablative works by gradually wearing away and eventually would probably wear back to the gelcoat
i suppose. at some point you have to put on more ablative paint
. hard paint never goes away, although it eventually becomes ineffective and has to be repainted every so many years. i have found pettit trinidad, a hard paint, to be the most effective in the area that i sail (florida/bahamas).
2. I am at the point of sanding
all the accumulated antifouling by the years to the level of original paint/gelcoat. Several patches of antifouling has started to drop off.
good idea, and that's what i had to do. you have hard bottom paint
and as you paint layer upon layer over the years it gradually loses it's 'grip'. but its a dirty job. i had to do it myself because i couldn't find a 'professional' to do it. do a lot of research
here before setting out. you will need a heavy sander, tyvek suits, professional sized respirator, and probably, depending on your boatyard rules, tenting. if you can find someone else to do it well, pay them whatever they want.
1. That is my opinion and no doubt I will (again) be told I don't know what I'm talking about
i'm one who will tell you that you DO know what you're talking about.
1. I always somehow imagined Kevlar was added for impact resistance. I thought stiffness came from adding carbon fibres.
when i bought my boat ten years ago i found that the bottom of the keel
(full keel) had possibly been run over an oyster bed
and was rough and slightly gouged. so i sanded it down and covered it with kevlar. not sheets
of kevlar, but ground up kevlar fibers in an epoxy
mix. i troweled it on and smoothed it out before it hardened. ten years later it's still on there and, i suppose, still protecting the bottom.