I should write that on my shop wall, I can never remember what is what. By constantly shrinking it only is a worry with old silk span models after decades of hanging in a garage. When paint or dope are mentioned the term used is hot fuel proof. That just means the exhaust slime. Most all of the nitro and alcohol are burnt off before it comes out the exhaust. Nitro would make a good paint remover if it wasn't for the cost. It evaporates pretty quickly and I haven't had any problems with it softening up dope. All my 1/2A stuff uses 30% nitro.