Cause you're asking questions to things I been doing for years and I'm giving you a straight up answer?
You can beat around the bush asking the same questions that have been answered 1,000,000 times before (no one told you to "go search" which most forums do) or learn by yourself or take the advice clearly typed out by Scotty or others who took the time out their life to answer you.
So don't be a salty Sally.
yes. I use my propane before I spray ANY solvents in my freshly done engine bay