Hi and welcome to the forum, tell us also a bit more about yourself and your fish (in the welcome thread http://forum.simplydiscus.com/forumd...Welcome-Centre ).
Never tried the sand-epoxy mix, could be an option once the fish are done growing. Maybe at some point I'll do a small scale trial. Would not stick it directly to the bottom of a large tank in case it needs removing if the results are not satisfactory.