There's two types of acraglass that I use. Gel, and regular. The gel (50:50 mix ratio) is tough to get worked into a crack and tends to stay pliable for a long time. It eventually hardens completely but takes a long time. A trick for the white epoxy part when it gets crystallized in the jar from age is to put in the microwave for 5 or 10 secs. Restores it back to its new state. I let it cool to room temp before mixing with hardener.
I prefer fixing cracks with the regular acraglass (4:1 mix ratio). It's viscosity is like warm syrup. Very runny. It works itself down in a crack very well when freshly mixed. It hardens much faster and harder than the Gel. To change the viscosity to whatever stiffness you need I add "micro balloons" or phenolic micro beads.
Both gel and regular can be dyed brown or black with the dye tubes that Brownells provide.
As far as adding heat on purpose, note that heat is what activates the epoxy to cure and harden. Alone it's a chemical reaction when the two parts are mixed. Adding heat will drastically decrease the work time available if you're doing something like bedding a rifle with it.
