I have found that the bowls seem to flatten out so I just make them flat an wide like a placemat (but not as large) and use them out of the microwave after food has been zapped...my family tends to put their dinner plates in the microwave to reheat the food so this works perfectly for them to sit and watch TV with the plate on their lap..which is unfortunately what most of us do...lol..but I also think it is not a money maker since you can barely recover the cost of your materials and that would give zero money for labor...I think coasters would be better...easy to make/fast and can use scraps...(especially batting scraps which most of us have a lot of)