Crusty Additive F

I have a small bottle of Additive F that has been sitting around (sealed) for several months.  It has a solid crust on the surface.

I read some posts that said you could heat it to make it liquid again.  Will this work?  If so, how hot do I need to get it, for how long?

Just shake it up and warm it gently by putting it in a warm place. The wax will re-melt back into solution.