The key to dying plastic, vinyl, etc. is preparation. You have to THOROUGHLY clean the surface of all oils, dirt and contaminants. I use a good automotive grease and wax remover, then way it with water and a mild detergent. let it completely dry for at least a day. Wipe it with the grease and wax remover once more, let dry. Then spray it well with the prep agent which softens it, opens the pores and prepa it for the dye. Once the surface is dry (15-30 mins) spray light coats of dye, slowly building up the color. I use the SEM products and been very happy. Most problems come from failure to clean and prep or spraying too thick.