3305 MP Flexible Primer Aerosol for Metal and Plastic Gray is a specialty aerosol primer designed for use on metal and plastic parts. This primer helps prevent corrosion by sealing out moisture and provides an excellent base for topcoat application on the majority of metal substrates. Additionally, MP Flexible Primer has excellent flexibility and adhesive properties which enables priming of flexible and rigid plastics. MP Flexible Primer is fast drying, provides great film build and coverage while exhibiting ease of sanding. Compatible with virtually all automotive substrates.