Plasti-kote Primer Polystyrene 200 ml PKT10603 Plasti-Kote polystyrene primer is specially formulated for protecting polystyrene surfaces. It creates a barrier to prevent the spray paint dissolving the polystyrene. Ideal for decorating arts and crafts.Polystyrene is available in different densities. This spray is suitable for high density polystyrene. For low-density polystyrene, it is unlikely that spray paint will be compatible.Drying time: 5 minutes between coats, 2 hours total. PKT10603