Is there such a thing as a hardener that can be used on enamel after it's been applied, even if it's already cured partially? I'm looking for something similar to spray-on activator for super glue.
I want something that can make enamel hard enough to be sanded without the usual long wait, and neither heat nor lacquer are options. I realize that there are two-part paints that will harden in less than a few hours, but I'm looking for something different.