what OZ fiberglass?

[shiner1836]

What oz fiberglass would yall recommend? I am in the process of platdecking my 650sx, I have foamed is and will be ready for glass soon? I was looking at the 18oz from uscomposites, anyone else have any better ideas? lighter, heavier? how many yards yall think it would take, how many layers to apply.
Thanks!

 

[GDFL]

3+ layers of 1708 knytex would be good for that application. Flatdecking really takes away some good structure so you can't skimp too much.