We spent almost $50 trying to patch a hole in our dishwasher tub caused by a broken heating element melting through it. We tried several different epoxies, silicon caulk, dissolving pvc shavings into a paste. Nothing held as it was right under the element and the heat would affect the bond. What finally worked for us was JB Weld Plastic BOND (not plastic weld...we tried that first). We had to confirm what material our tub was (polypropylene) to figure out what would mesh with it. Just letting everyone know what worked for us!