Closed cell plastic board used by print writers is an excellent material to apply Screen Goo front projection coatings to. It is very hard and durable and requires no priming prior to being “Goo’ed”. It is, however, somewhat floppy and should be supported to ensure a flat viewing surface. We suggest choosing white and a minimum 5mm thickness.
It goes under the trade name Forex from Alcan other brands like Foamex are just as suitable.
You can also use ply which would need priming and battons to keep it flat.
MDF is also freqently used to good effect
Blackout Cloth – 3 pass foam, sometimes called blackout cloth, is an excellent fabric substrate for a front projection Goo application. No priming or special preparation is required before “Goo’ing”. This material can be used with a stretcher frame to make a lightweight, portable Goo Screen. It is sold by the yard and available in widths up to 110″. Rolled Screen Goo applications are not recommended for blackout cloth. Spraying will give optimal results with this substrate.
Mesh for holomesh illusions needs the mesh to be sprayed with Goo Silver 3D