The problem is you can't just dump a bunch of resin in a mold and expect repeatable results. You need to get a decent low expansion epoxy, one that has a simmilar coef to steel works fine. You need to wash everything with a solvent. The big thing is, you need a shaker and a vacuume pump for your mold. That way all the agregate is firmly packed. Also the vac will remove most of the problems with voids as long as you are not using too viscous an epoxy. I'd like to do some experimentation, but I lack the $ to setup a proper experiment and my physics classes are taking up too much of my time. If anyone has the time and money to do it please post your results here. |