Transtar 1031 Mul-TIE Adhesion Promoter will enhance adhesion, appearance, and durability of nearly all automotive finishes, including problem plastics like TPO and polypropylene. Use under primer on both flexible and rigid plastic parts. Use as a tie-coat between fresh or existing primer and color. Use to paint aluminium and steel. 1 Gallon. TDS 101. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.