There are two types of dope. Nitrate and Butyrate. Nitrate is not fuel proof, Butyrate is. Nitrate is mostly used for attaching fabric to the structure and then sealing the fabric before painting. Butyrate is used for the color coats and clear is used for sealing. You can paint over Nitrate with Butyrate but you can't paint over Butyrate with Nitrate.

Rich