fiberlass resin or not to resin

this is very contrevercial i found this weekend that it works ok in in places but not as well as the other epoxy that ive been using stone effects step 3 counter top coating i got from home depot but very expensive for the quantity in need ive yet to find out this vs marine epoxy resin i just found a place to get it yesterday turns out i live down the street from it the big mistake i made was the fiberglass resin did not stick well to a coat of paint i put across the front i had coat of epoxy under it though itll be about a month before i use it if i use it and i will post the results