ok, good ideas here.
what is Polycryllic? is it similar or better than polyurethane.
after some searching last night, I did notice in a Japanese blog, that silk was used, and what looked like polyurethane. that was wet sanded.
that link to Don Ramseys site is a wealth of helpful tips as well. I have used dope and tissue or silk a lot with control lines etc when I was younger.