Epoxy grout is preferred for pools because it is more resistant to pool chemicals and staining, but it shouldn’t be used on art object or plaques that might be around for decades or centuries as heirlooms.
Epoxy is a resin of long carbon compounds. Long carbon molecules are prone to breaking overtime because they contain stored chemical energy. They are vulnerable to things like oxygen radicals and UV radiation.
On the other hand, traditional grouts and mortars are made from kiln-fired sand and limestone and clay, which are all basic mineral substances with little stored chemical energy, all materials that last for geologic ages.Continue reading