home depot website says this about it...
"The Plasti Dip 11 oz. Flat Black Vinyl Coating Spray is great for auto, RV and marine applications. The spray comes in a flat black color and dries to the touch in as little as 30 minutes for quick applications. It can be used indoors and outdoors and requires a primer for use. The 11 oz. can works well on areas up to 5 sq. ft."
Do I really need a primer for my wheels?