I take it you are in one of the desert areas of AZ. I have a situation here in the Phoenix valley, where I have to hold off on lacquer paints until like October every year because it is always too hot to paint in my garage during the summer months. You can order your paint in the "cooler" months with no fear of the cans blowing up.
I use the Testors enamels and have no problems with the stuff, as a matter of fact, some of my best paint jobs have come from Testors enamel rattle cans. With metallics and metalflakes, if you wet sand, you'll get a blotchy look to them because you are actually removing some of the "depth". I would opt to strip it completely and start over. You might want to check out Testors new One Step lacquers, also, because they do have a gorgeous red metallic.