If you're not sure the consistency is what you're looking for or want to check the scent/flavor, pour a small amount of the mixture onto a piece of waxed paper and put it in the fridge and put the pot with the rest of the mixture back into the double boiler to keep it warm. After a few minutes, take the sample out of the fridge and test it out. If it's good to go, simply pour the rest of the mixture into the waiting tubes.
If you need to adjust, do so in small amounts and check again until you find the perfect blend.