NPP Acc Paint Tray 4 inchSolvent resistantFor use with paint rollersApplication Instructions:Dip paint roller into the well to coat it with paint.Roll the paint roller back and forth on the ridged part of the tray to squeeze out excess paint and evenly spread out the paint around the roller.To save the hassle of cleaning up, cover paint tray with an empty clean plastic bag or aluminium foil before pouring in the paint.