The best paint
may depend on where in the boat it's to be applied.
I was a total ignoramus (maybe still am) when I started. The paint companies technical support led me down a few dead ends and I wasted a few hundred dollars on buying
the wrong paint.
Before doing anything else I believe it is essential to make sure that all internal water
drains freely to the bilge
and that all possible sources of internal water
are minimised. Good hatches/portholes, no deck leaks
to minimise condensation
, keeping the boat ventilated-That sort of thing.
So where possible drill the largest possible drain holes through frames and stringers. Do not drill through the hull!
Do not weaken the frames or stringers. Small holes tend to block up so may be a waste of time. I have used generic epoxy
resin to fill any small hollows that I could not get to drain after cleaning
them out as much as possible and treating them with tannic or phosphoric acid.
The key factor in deciding on which paint and how many coats is whether the area will get wet, and if it might be salt water
Inside the boat I have used single
pack enamel paint advertised as suitable for painting light rust in areas like the underside of the deck
. In other areas my system now is to prime one or more times with Penetrol CIP. This is advertised as a penetrating primer, but only seems to be available in Australia
. I topcoat with International Primocon which seems to be OK so far.