This is one of our favorite products- wax used to hold stock for machining.
We find it invaluable for machining thin metal, like aluminum and brass, without using double side tape that gums up the cutter. It also makes it easy to remove the finished part without prying and bending it.
Here's our process:
Heat your stock using a heat gun
Drop a few pieces of fixturing wax and continue to heat until melted
Flip part and press it down onto the MDF wasteboard or other backer material