I’ve been experimenting with paper back tinfoil wrapping paper and making rock walls with them.
And it works!
- size out the piece you’ll need
- add 30% to the dimensions and cut out
- Decide what direction you want to orient the rock structure in
- crumple, compress and recrumple the tin foils paper until you get the desired effect
- spray with white primer and let dry
6)spray high expansion insulating foam on paper (back) side of tin foil paper and gently place in location.
let it stand over night to cure before further painting.
It doesn’t look bad at all when I get pictures I’ll post them.
The following picture is using craft paper and the same method, the tinfoil paper has sharper rock edges

Regards
Fergie