I've made a suit out of latex and foam latex. I've painted it following the directions in the Make a Monster Suit videos (painting with mix of oil, rubber cement, and paint thinner, then sealing with light coat of rubber cement). After letting everything sit for a few days, everything I've painted is still sticky (especially the foam latex hands, which are so sticky it's damaging the paint job). Have I done something wrong? Is there anything I can do to stop it?