Paint Adhesion promoter and repair 140* to 200*!

I have several types of Paint Adhesion Promotor for flexible surfaces and both require one good coat and then for best results be heated to 140 to 200 for 10 minutes. That is not hard with small parts but how about a valance or grill? any thoughts on how to heat this up?

Do you have a wood burning stove, or a portable heater? I would just be afraid of the fumes catching on fire.

Yeah thats my thought. I do have a quartz portable heater. and some scrap 1x2 lumber and tons of cardboard, maybe make a sma small drying booth.......Like 2' tall 2' wide and 7' long and put the heater at one end and a few small ports at the other end........