RE: Hardening Balsa
I have used two coats of sanding sealer then sanded it then used one coat of Deft sanding Laquer then sanded again. Not very much added weight and the wood is a lot tougher. I have never tried the watered down glue though?? I just watch what I'm doing {like that helps!} and when I do get a deep ding I just use light weight spackling paste like 8 mentioned. I really hate sanding!!!