Courtney Thomas wrote in message ...
What is the difference in the following paints for the optimal barrier
coating for a fiberglass hull:

1-one part epoxy

2-two part epoxy

3-LPU

4-somethin' else

What would be the most effective sequence for barrier coating for a boat
that has had nothing done beyond Awlgripping [over 5 yrs ago] ?

Appreciatively,

Courtney Thomas

Dont bother. It is my understanding that nearly 80% of all osmotic
blister repairs including overcoating and gelcoat shaving fail. I
have asked several marine surveyors if they have ever seen a case of
hull failure due to osmotic blistering and they have all said "No".
It seems to be primarily an aesthetic problem that hardly affects the
sailing ability of the boat.
It seems that if the glass was not fully wetted with resin, you will
get blisters regardless of what you do. This is the case even on very
high quality boats. The have no effect on hull strength.