Light Theatrics offers two great methods for blocking out unwanted light and hiding things that you don't want to be seen.
Commando Cloth is an economical choice for all of your Haunt masking requirements. This flame retardant, cotton fabric has a multitude of applications due to its brushed napped surface and light absorbing qualities. It has the look of heavier velour fabrics but without the actual weight and cost and is a must for any Haunt enthusiast.
Need a blackout material that can take the heat? Try Apollo Foil. The foil is black aluminum, non-reflective, high heat resistant material that is perfect for blocking out unwanted light from lighting fixtures. It comes in 12" x 50' rolls (24" x 25' rolls available by special order).
All prices are in USD.