I do love my tank cutter
I have told Dh that the tank and silicone mold he made me are what I would save in a fire. Seriously, they were packed in my car when we had wild fires in the area a couple months ago. I love the silicone molds and won't use anything else now. I have acrylic ones and will use them if I have to, but don't really like them because you have to babysit them and unmold at just the right time to get them not to stick.
When I first started, I would line my wood molds with craft foam from walmart. They worked great. Just beaware they hold in more heat than freezer paper and you have to pour at a thicker trace or else they leak, but were reusable and easy to unmold.

When I first started, I would line my wood molds with craft foam from walmart. They worked great. Just beaware they hold in more heat than freezer paper and you have to pour at a thicker trace or else they leak, but were reusable and easy to unmold.