Frustrated

I tried using Mr. Surfacer today without any Mr. Color Thinner...tried it with a local lacquer thinner "Bronco"...surfacer was fine but I think I made a mistake in buying the 1000 instead of the 500...problem was the thinner...it melt the plastic a bit...now I have to sand it...I'm going to wait for the Mr. Color Leveling Thinner before I proceed with the Sabre or any builds...