Iron Man Power Suit #6 | Plastic Coating Foam | James Bruton - YouTube
All Purpose Foam Coat | Hot...
Styroplast Foam Coating |...
All Purpose Foam Coat | Hot...
FoamCoat
UreCoat™ Product Information | Smooth-On, Inc.
Styroplast Foam Coating |...
HARD COATING STYROFOAM! Cheap Way To Make Foam Props Strong (Big Halloween Pumpkins) - YouTube
Smooth Foam Bells Available in 4 Sizes Hollow Core EPS - Etsy
A one-step method to coat polystyrene particles with an organo-silica shell and their functionalization - ScienceDirect
Gel Coat FRP Smooth Finish - China FRP Smooth Finish, Smooth FRP Finish | Made-in-China.com
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.