I had some rtv that expired last may. It had thickend up considerably,but I also had some expired thinner so I decided to try a couple LARGE size molds.Figured I had nothing to lose. I used a couple cake pans and made two worm molds with a dozen cavities each. I brushed the bottom of the pans with super glue a couple inches at a time laying out my worms as I went. Let dry overnight and poured yesterday. Since the rtv isn't supposed to bond with anything but silicone I didn't coat the pans with anything. Shoulda,coulda,woulda but..... Demoulded the first one today,Perfect. Second one...Not so much. Wouldn't budge.Couldn't get a putty knife between the rtv and the pan. 100% bonded. Doah!!! Removed it with a razor blade with limited success. Saved 5 cavities. Rtv was STUCK to any part of the pan that wasn't glued. Pan must've had some sort of silicone coating. The cake pans make great reusable mold boxes but in the future any new ones will get a light coat of vaseline as a release agent for sure. I'd have been very unhappy if that had been new rtv. Although the old stuff worked perfectly once it was thinned down. Thought I'd give ya'll a heads up and maybe save someone from scrapping their high dollar mold material.