RE: What brushes for dope?
I haven't used silkspan in years, but I use Koverall and dope exclusively on my Waco's. I put the Nitrate on with a cheap Chip Brush, and then lightly sand with 400 grit, and that removes the stray bristles. I finish mine with spray equipment (HVLP) and normally use Automotive Base Coat/Clear Coat for the final finish.
Bill, AMA 4720
WACO Brotherhood #1