I am redoing a Ruger Mk II with some rust issues and am thinking about coating with a ceramic header paint that needs cooking at 600 degrees F.(I think my oven max out at 500F) I have concerns about heat treating what ain't supposed to be heat treated and degrading the heat treatment of hardened parts. Should I worry about the temper or annealing? I really would like to know from someone that knows for real the dangers of heating firearm components to that high or just to 500 F. No Conjecture only the truth and nothing but the truth. Danke RZ