Once you've got your color and scent well stirred in, pour the gel slowly into the beer mug. Since we don't mind the air bubbles in the gel, I'm not going to worry about pre-heating the mug - but if I was doing say a "wine" candle - or some other gel candle project, I would pre-heat the mug in the oven or with a heat gun.
Remember to leave about 3/4" of an inch at the top for the "foam."
While you can start the next step right away, you want to wait until the top of the gel has firmed up enough to support the foam...which will take about 10 minutes or so.
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