The phrase "to fill the molds" means to pour something, often a liquid substance, into a container or shape so that it takes its form.
Sentences with «to fill the molds»
To get a good idea of the size of mold needed add together the oils and water in the recipe and then fill a mold with that amount of water. (savvyhomemade.com)
Then fill the mold and clean the top with an off - set spatula. (eugeniekitchen.com)
Remember, you still need to add a layer of chocolate, so don't fill the mold completely. (savvyhomemade.com)