Right now I'm doing watered down Elmo's wood filler.

I've done the sticky paper and glued edges. Good results.

I scored a bottle of AeroGloss Dope Sanding Sealer a few years ago.

I crack it open and take a whiff and it brings me back to my teens building balsa model airplanes.

BTW, you can make your own sanding sealer like AeroGloss.

Nail polish and baby power.

A 90/10 mix. Give or take a few.

__________________
If it flies, I can crash it!