the balsa is to hold the glue to the corners not for stringers. slow down and read. balsa is fine for using as glue filler blocks in corners to get away from using a large fillet of epoxy to close the joint for great weight savings without sacrificing strength. nobody mentioned it for structural building such as stringers.

hair spray such as final net does not contain "water" where it "soaks" the wood - it is fine as a barrier coat, and has been used sucessfully, cheaply and easily for years with laminators. You do NOT want to use airplane dope as a barrier coat. It does not dissolve under epoxy, and will peel off wood like a sheet of paper if water gets under it.

Rude already knows about the aircraft wood, hes already replaced some with aircraft ply to save weight.

when you use CA as a tack glue..i hope your tacks are perfectly in place the first time...you dont get another chance at gluing the joint over again, and your not bending and pressing on the wood to get it to kick off.

I would never use CA on ply that is eventually going to recieve epoxy. it is better to let the epoxy reach the wood, and not sit on top of CA that pipes itself a good inch away each side of the seam. You are starving the joint of epoxy. have you ever tested the strengh of epoxy over CA film? I have and it sucks.

A dab of hot glue for a small tack is perfectly acceptable and superior over CA for repositioning before it sets. If you sight or measure your layup and see that it is off, or you want to change something before you final glue the sheet or what have you, it gives you another chance and peels off very easy leaving the wood like you never touched it. Much better gap filling ability during tack work. It works great. It is POSITIONABLE and RE-POSITIONAL.

You dont have to be sorry about large gaps when building ever again, in fact...tight joints are not even really desirable due to their ability to spring and twist the entire framework when pulled off the jig. Hot glue tacks and balsa glue blocks. Best way to reach a perfectly straight, strong build. The worst framework is one that is built under joint tension. Float everything in, then "freeze" it with your balsa glue blocks in your wetted corner.

75% weight savings? Where's the boat?