Silicone Jello Molds Can I put the gelatin in the silicone molds? Use the silicone mold for the jelly as for the cake dough. Once the gelatin has set, fill a large bowl or sink with warm water. Put the shape halfway up for a few seconds. It should come out as soon as you turn it on a plate. With that in mind, will Jello stick to silicone molds? Only one problem: when JelloO uses a typical gelatin form of silicones and polymers, there is no room for air, i.e. there is no vacuum and nothing to...