5 Litre Crown Trade Alkaline ( Px3 ) PrimerCrown Trade PX3 is a solvent based, adhesion promoting primer for interior & exterior use. Ideal for difficult substrates including glass, ceramic times, melamine and previously painted surfaces, as well as most wood and non ferrous metals. It also has excellent stain sealing properties and can be used on most surfaces subject to staining smoke, crayon, tannin, water stains and aerosol etc. Stains are held in the primer and will be obliterated by the