[okie01]

"Jeez, I use this stuff as an additive in museum exhibit resins..."

For my education, could bentonite also be used in your particular application?

[piasa]

I suppose so but I haven't used it since I've always been happy with Cab-o-sil. Though anything goes depending on what we're trying to mimic. Bentonite is used with fiberglass work, so I hear, but I doubt if it is fine enough nor light enough for my purposes, which require fine detail.

The only bentonite around here in quantity is in the kitty litter...