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.
Artist Sandra Arkin’s bas-relief mosaic sign “Art Can’t Hurt You” makes me laugh.
Anyone who has ever made a glass mosaic with tiny details has anointed their work multiple times with blood. Am I right, or am I right?
Sandra says doesn’t draw or make representations of physical objects in her heart usually, but she is pretty adept at making patterns with her printer when she does want an actual image.