I've been doing my research in light weight glassing techniques over the holidays... searching RCU, seaching the internet, e-mailing questions to the experts, what not. The major criteria for my research is light weight.

So far I've found two acceptable light weight methods from members here on RCU... Branded's method and ProfLooney's method.

Branded's method
1st coat: Thinned epoxy (seals wood from water content of next layers preventing warps)
Next few coats: Water-based polyurethane
Next few coats: Water-based polyurethane w/ microballoons

ProfLooney's method
1st few coats: Lacquer based sanding sealer (prevent wood from soaking up too much ployurethane, reducing weight)
Next 4-6 coats: Lacquer-based polyurethane

Correct me if I'm wrong, guys. ProfLooney has a great website explaining his method (http://home.mchsi.com/~jahuntley/help.html).

The key to light weight is to use as little epoxy as possible, or none at all. Epoxy = Heavy.

Juice