HARD COATING STYROFOAM! Cheap Way To Make Foam Props Strong (Big Halloween Pumpkins) - YouTube
Smooth-on Urecoat Flexible Coating - Stage and Screen FX
Terrain idea: Tried to smooth styrofoam, turns out enamel spray and acrylic clear coat have some interesting cratering effects instead. Could be useful. That said, like any spray painting, do it outside.
How To Coat Carved EPS Foam Using Habitat Cast N Coat™ Epoxy - YouTube
UreCoat™ - The Compleat Sculptor
FoamCoat
All Purpose Foam Coat | Hot...
HARD COATING LIGHTWEIGHT FOAM BOULDERS - YouTube
Foam Coat - 3lb – brickintheyard
All Purpose Foam Coat - The Compleat Sculptor
All Purpose Foam Coat | Hot...
EPSILON™ Series, EPS Foam Coating Epoxy | Smooth-On, Inc.