Ok, I'm knocking on wood, but I have only had a problem w/the mold seal maybe twice (in a year and a half) - I make sure to press it down firmly around the edges, press, press, press lol. I reuse it all the time, and especially if it's heated w/the heat gun after I clean my molds it's more pliable.....but press, press, press around the edges if nothing else. I have yet to try the metal tape. I'm sure I will at some point.