I always use 5 gallon bucks. Just so much easier to use, and loading the roller is easy. With trays, the roller slides along the surface, those ridges don't do crap to turn it over to the dry side. I've smashed a lot of pans in the early days. For small stuff, I will use a small plastic grid in a cut pot. It works terrfic, as long as you have the plastic grid that doesn't break. Lowe's has a red one with a thin "handle" at the top that's designed to rest the roller on, but it breaks and lets the roller sink into the paint. I bought some blue ones at Home Depot that had were solid at the top eliminating that problem....