In all of my racks I have always dadoed(sp) the shelves or otherwise devised something so that the tubs don't rub directly against the flexwatt. I have always been nervous that the tubs would eventually scratch through the plastic coating and cause open hot spots. However, more and more I am seeing people placing their tubs directly on the flexwatt. This would take tons of time and complexity out of building future racks. Are these people being careless? Will they have to replace the flexwatt eventually?


