SMR-500 Speedo Stick is an adhesion promoter designed for use in the automotive refinish industry to promote strong adhesion of paint on plastic parts like bumper covers and interior panels. It contains etching resins that coat and seal plastic to allow adhesion of all types of paint systems without prior sanding, though sanding further enhances adhesion. Speedo Stick is applied with an air gun or cloth and allows painting within 20-30 minutes as adhesion fully develops over 12-24 hours of curing.