Heat this gently over a double boiler for a few minutes, until well combined and warmed through. Or, put in a microwave-safe plastic or glass dish and heat on low heat for a minute, stir, and heat for another 20 seconds and stir again. If you're just doing a single recipe, this is all you'll need to heat the mixture before bottling. If you're making large quantities, microwave for a little longer. Spoon or pour the vanilla lip gloss mixture into tiny glass or plastic containers and store in the fridge to harden slightly.