Graham_Wright
Well-Known Member
Convinced that raw polyester grp is permeable, what is the best covering for bilge spaces;- gel coat, bilge paint?
Any recommendations please?
Any recommendations please?
Bilge treatment
- Thread starter Graham_Wright
- Start date
andy_wilson
Well-Known Member
Gel-coat.
But to fit it, you need to grind the existing surface back to provide a key. If it isn't done before the original cures, gel won't stick, so bilge paint is a better option.
But to fit it, you need to grind the existing surface back to provide a key. If it isn't done before the original cures, gel won't stick, so bilge paint is a better option.
Rick
Well-Known Member
If you're convinced raw polyester grp is permeable, then gel-coat won't help, as it's basically polyester with talc. I don't necessarily agree that it's permeable, but if you wanted to paint it, then a two-pack LPU will give enhanced protection to the grp. I'd use a tradename industrial coating rather than one of the popular marine retail brands as price is significantly higher in the retail products.
Graham_Wright
Well-Known Member
Thanks for that advice. My own experience with built-in GRP tanks leads me to believe it is permeable and others have agreed. But presumably gel coat works on the outside or is it all down to my poor layup?
Tisme
Well-Known Member
[ QUOTE ]
then a two-pack LPU will give enhanced protection to the grp. .
[/ QUOTE ]
LPU? If you mean a poyurethane then I would suggest that a two pack Epoxy would be much better. Epoxy is a superior water barrier.
then a two-pack LPU will give enhanced protection to the grp. .
[/ QUOTE ]
LPU? If you mean a poyurethane then I would suggest that a two pack Epoxy would be much better. Epoxy is a superior water barrier.
Graham_Wright
Well-Known Member
As an addendum, I eventually coated my grp tanks with Thistlebond. I am assured that will do the trick.