Here's the metal tape link. http://www.candletech.com/metaltape/ It works really well. However, on the larger molds, particularly the metal ones with the base, I've found you have to use lots of putty and tape. Sometimes, with large molds, I've even overlapped the sides of the mold with the tape. Have never had the problem with the aluminum molds. Make sure that the tape is really sealed. To do this I run a little plastic glue stick over the it and make sure there are no gaps. Make sure the edges of your tape are really smoothed down too.