Lightly spray with a small spray bottle, using about 2 sprays at a time and mixing after. Continue to do this until you are able to grab the mixture with your hand and it holds form, not falling apart. Avoid spraying too much or it will start to fizz. Think of it as slightly dampening the mixture.
Tightly press the mix into your molds.
If you are using silicone molds, leave to dry overnight and slowly pop them out the next day. About 12 hours. If you use the metal bath bomb molds, do not leave the mixture in them. They are for forming purposes only. Press the mix into both sides of the molds and smash them together. Carefully remove and set aside to dry overnight. About 12 hours.
Recipe from https://sweetnaturesbeauty.com/