yeah i have the fillers on the cheap. sand and sand pebble from the building center. works well on the cheap side. sand blast media would get really expensive and with epoxy being the real cost of the process. i know what i have is at least as strong as concrete on the compressive strength side of things. the epoxy works well it is just harder to mix and takes more than 12% and ends up being like 15% any less it becomes to dry and to hard to work with. i seen conversations here on using far less than 12% even but it does not work with what i am using. what i have is pretty impact resistant as well so i was happy with what i came up with. probably not the most cost effective mix but it seems to work well.