I use pink buckle wax.
I don’t do much to modify my injected waxes. If I have to grind or
file a piece I place it in a cup of ice cubes for a short time.
I spray my file with mold release. The wax does not stick to the
I use a three point wax burr most of the time for removing wax.
There are injection carving waxes on the market. I have not had
success using them.