For thin candles, they will likely only need an hour or less in the freezer, while thicker pillar candles will need 6-8 hours. If you have more than one candle, test just one in the freezer before adding the others—some candles have been known to crack when frozen.

You’ll need to work quickly once you blow out the candle so the wax doesn’t harden before you’re able to sprinkle in the salt.

Always wait until the wax and wick have cooled before trimming it.

If your candle is burning with the wick uncentered, it will burn unevenly.

If you’re not sure whether the area is drafty, look at the flame of the candle—if it’s flickering or moving to one side, it’s being affected by the air.

This may take roughly 2 hours for a thick candle, and much less time for a thinner candle.

Avoid letting your candle sit out in the sunlight for extended periods of time.

Burn marks usually only happen when your candle has burned for too long, so try to blow out the candle within 4 hours of it being lit.