For what it is worth, the guy who made those foam/modeling paste backgrounds said they were not ideal for super high heat cages. Like what you would use for basking lizards. He said they surface got a bit soft.

But for a Rainbow Boa you should be okay. That's just a guess on my part.
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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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