To shape the bowl you can do a few different things. You can:
- drape the record on top of a bowl. Once the record cools it will have a similar interior shape as to the bowl. - drop the record into a bowl. The outside of the record bowl will then have the same shape as the bowl. - drape the record on top of a cylinder such as a can of soup.
Once the record cools, it will harden into place and stay that way. If you're not happy with it, just toss it back in the oven for a bit and start over.