I use those PPS liners at the shop, too. What I do, though, instead of letting the paint dry in the cup -'cause that can take forever with base coat- is to pour it in an empty gallon can, then throw the emptied cup away. I use the same gallon can to dispose of left over clear, sealer. primer, and base, so it all dries together. I throw about 5 gallons away a year. THis way, you don't have a bunch of cups crowding your table top like this:
