I am doing the same on my Nonsuch 30U. I started by cleaning
everything with a strong solution of 2 parts
Simple Green and 1 part Sugar Soap. Then I primed the fibreglass without sanding
using Zinsser Bullseye 1-2-3 Primer (made by Rustoleum).
Zinsser Bulls Eye 1-2-3 Primer/Sealer
I am finishing with 2 coats of a basic water-based enamel. Water-based enamels have reached the point where they are equivalent to oil-based, without the fumes and with an easy-clean at the end of the day.
There is no reason to use marine
paints on the inside of the boat, and the Bulls Eye primer sticks to anything. I have even gotten it onto glass by accident
and it was difficult to remove.
The only place I didn't use this system was in the bilge
, where I used flow-coat, thinking that standing water
could be a concern.
Worked an absolute treat.
A Kiwi Nonsuch 30 Ultra: Painting the 'nether-regions'