Thanks for all the great info. I have been very successful with opening the cans with a safety can opener. As for the sand or any other filler, I was trying to think of a way to not use as much wax, but still have the wax to the top of can and also give the can some weight and stability. Any thoughts on a filler. I would reach out to local breweryies to get permission first before using there cans, hopefully. Again thanks for any info