I have never made any candles before but I am thinking about making some candles out of the many empty craft beer cans I have. One thought is, I did not want to waste a lot of wax filling up a whole 16oz can. Is there something I can fill the can with 1/2 way, then fill the rest with wax? (sand?) Also hoping this will help keep the lower part of can cooler. Thanks for any feedback.