On Wed, 13 Jul 2011 06:39:53 -0700 (PDT), Panxerox
wrote:

I've done fibreglass work before but just bought a 12' canoe mold,
what mat weight would you suggest for the build up? 1.5oz?

I would try to keep it as light as possible by using no mat at all,
just light weight woven roving with a foam core in the middle.