Diy Silicone Mold Cornstarch. You can also use silicone sealant and cornstarch. Wait at least 12 hours for the chalk to dry before popping it out of the molds and using it.
Cut the tip off of the silicone tube and put it inside the caulking gun. Put your gloves on and throw some cornstarch into a container. Squeeze some silicone into the cornstarch.
Mix thoroughly with a small spoon or stick.
Put your gloves on and throw some cornstarch into a container. For this method to work, you need to get construction silicone in a bowl and add twice the amount of cornstarch to the silicone. I tried combining caulk and cornstarch back at the beginning of my 100% silicone caulk mold making adventures. Then add some more cornstarch on top of the silicone and stir using the plastic knife.