I suggested this product to my husband to help him in painting our master bath and it worked great. It is much better than having to go back to the paint tray to load the roller every time. This worked fast and cleanly (no splatters).It is not for use with primer, it's for latex or oil based paints."Priming the roller is important, do not oversaturate the roller, for best results, maintain a steady flow of paint to the roller cover."