Most of my form projects are for building back ground feature in vivariums. Many which are made to look like rocks. The grits can be added to the coating finish to add to the realisum of the rock features. I often paint over the coating to give depth. Adding the grit to the foam coat can sometime be lost if to much paint is applied afterward. But the grit can also be added in brushed on paint to add another depth of realisum to these rock features.
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