Correct weight of Roving Mat for deck glass up

I am putting down a new deck in my ski boat. 1989 Ski Centurian. (The new stringers and transom are already installed.) I am looking for any suggestions on the correct weight of roving mat to use. Here is the plan that I have been following: (feel free to attack it with a red marker!)

1. Use Aquatek plywood (1/2" for under the bow, 3/4" for the rest)
2. Cut and shape plywood pieces.
3. Use thin coat of polyester resin to coat both sides of the pieces (for moisture protection)
4. Install the pieces with polyester resin(+silica)
5. Drill holes and pour the 2 part expandable closed cell foam in.
6. Use roving mat and polyester resin to reinforce the corners where the deck meets the boat.(thinking this should be thicker mat??)
7. Use thinner mat and polyester resin to cover the entire surface of the deck.

Other Questions:

? Use gelcoat on the deck before glueing carpet down?
? Is using roving mat on the top of the deck necessary?
? Should I use thicker mat on the corners?
? Suggested weight of mat
? Polyester resin OK?

I coated my ply with a layer of glass on both sides for more strength when screwing seats and acessories down. jeff

I would suggest visiting US Composites' website. You'll find the Biax, as well as many other types/weights of glass there. They offer good product that is reasonably priced. You can also contact them to get there advice - they answered all my questions and then some.

I took your advice and called US Composites and spoke with their technician. He recomended that I go ahead and use Polyester since I started using it and epoxy wont stick to polyester and vice versa. He said that if I put a couple layers of cloth down and then glue a carpet down that I will have plenty of barrier from the water getting into the wood. I uploaded pictures of the bow area here as well as a 'before' picture of the stringers to my account.

TRBenj wrote: brianmax wrote: He recomended that I go ahead and use Polyester since I started using it and epoxy wont stick to polyester and vice versa. Its true that poly will not stick to epoxy... but epoxy sticks just fine to poly. Otherwise, all of the epoxy rebuilds documented on here wouldnt work out too well! Glass CC's were built with poly until 1989. I sure hope it was a slip of the tongue on USC's part- their techs are usually pretty good.

Confirm and agree!

Sometimes you really don't talk to the correct tech! It happens many times with many company's. Now, if you had been reading more stringer threads on CCfan, you wouldn't have been mislead!