D
diamondtiling
Epoxy grout is a 100% waterproofing solution ( if applied properly )areas that are immersed in water or subject to continuous wetting, the last job I used epoxy on was a milking parlour, 1200 mts and the spec specified epoxy, it comes in a tub ready to use, get your customer to put his hand in his pocket because its very expensive, If memory serves me right its about £90 for 5 kilos, but that was 4 years ago