In case anyone is interested, I did a bit more digging and found that fiberglass mat is more commonly used to form on the inside of molds.

Fiberglass mat takes more resin per yard to wet-out. A 1.5 ounce mat I found needs 24 ounces per yard.

The yard of mat is $2.55. 24 ounces of resin is $5.76, so the total for matt is about $9 per yard, or approximately the same as cloth.

How many layers of mat would be required compared to cloth I'm not sure.

Still, not worth it to me when 1/2" PVCX is just over $20 per yard.
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Currently keeping:

6.10 Gonyosoma oxycephalum (Javan, mixed colors)

0.0.4 Rhynchophis boulengeri

1.1 Philodryas baroni

1.1 Lampropeltis triangulum multistriata

0.0.1 Rhamphiophis rubropunctatus

0.0.2 Morelia viridis (Aru & Merauke locale types)

1.0 Rhodesian Ridgeback

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