Richard, I'm sorry that I didn't mention the cost of the urethane. But don't feel too bad, I buy it by the gallon at wellnorth of $100. I have discovered that where balsa model building goes a little of the clear urethane goes a long way. I don't know, however, if a quart plus hardener will do the whole Simla project You probably canget a reducer for it, but I would not reduce the mixed clear more than about 10%. That having been said, I was able to get my fuselage and tail feathers glassed this weekend. Now it's a bunch of prep sanding and some paint work. I will be ordering my CF tube and sleeve on Thursday so it shouldn't be too long before wing time. Yippeeeeee!