1991 Prostar 190 hull repair

[bstewart0529]

Why doesn't the epoxy stick well to the poly?

[MIskier]

Originally Posted by mikeg205

MIskier was an intern there and he cited vinyl ester as the resin...

In the older boats it was vinyl ester, now they use AME 5000 which is a blend between vinyl and epoxy

[TRBenj]

Originally Posted by bstewart0529

Why doesn't the epoxy stick well to the poly?

Epoxy will stick just fine to the poly... it sticks well to all types of glass, and is the strongest. The opposite is NOT true- meaning that poly will not stick to epoxy. It needs a conversion coat (like vinylester) first. This comes into play when doing a hull repair with epoxy, and then following with a gel repair (since gel is a tinted poly).

It would be helpful to know when MC made the change from poly to vinyl and when they went from vinyl to vinyl-epoxy. I know CC transitioned in '89 and '93. I would only consider a poly repair on a poly hull (though even then I would opt for epoxy for its strength and workability advantages). On a vinyl or vinyl-epoxy hull, I would not consider poly as an option.

[bstewart0529]

i used the epoxy yesterday. man is that stuff nice. I will let you know how the sanding goes later in the week. I feel i am done with filling the hole. we have five layers on the top and three layers on the bottom so we should not have any issues with the strength. Now we will start putting the hole back together and then start working with the gel coat. I will post more pictures once i get closer to getting it done. thanks again for the help.

[bstewart0529]

Here are some pictures of the work we did today. The hole is now filled and fixed. We will put one more layer of epoxy on the outside then start the gel coat.

[bstewart0529]

Hole filled

[bstewart0529]

Bottom of the boat

[bstewart0529]

The hole is officially filled.

[bstewart0529]

I hated that i didn't pull the carpet back but i will recarpet it next year once i put it away for the winter. For now we will just have to make do with the square in the carpet. As for the bottom the gel coat goes on this weekend. and then we start sanding and buffing.

[TRBenj]

Any shots of the inside of the hull (not floor)?