Rust-Oleum Brands 249058 White Ultra Cover 2X Enamel Spray Primer.

Plastic adhesion promoter (primer). For priming polypropylene (unprimed) plastic door glass frames before painting or staining. Not for use with vinyl or poly-carbonate (PC/ABS) frames.

• Promotes a durable bond for paints and stains
• Easy to use spray bottle, spray 1-2 thin coats from ~6" away and wait 15 minutes for primer to dry
• 12oz aerosol bottle -- plenty for several frame sets (5 )