3M says its PPS Paint Preparation System enables painters to mix less paint reduce the amount of solvent used and speed cleanup. Paint is mixed and sprayed from the same cup which includes a liner with a lid with a built-in filter. According to 3M specifically designed adapters allow painters to use the system with virtually any spray gun. Another key advantage of this closed system is that it enables a painter’s spray gun to function well at any angle even upside down. PPS is available in five sizes: Large (28 fluid ounces) Standard (22 fluid ounces) Midi (13.5 fluid ounces) Mini (6 fluid ounces) and 3 ounce.