Why does my candle have wet spots?
Short answer
Temperature changes as the wax sets: a cold room, a hot pour, a cold or thick-bottomed glass, drafts, or candles too close together.
Explanation
The book also names stirring too hard (trapped air) and using mold wax in a container. Glasses with uneven wall thickness, such as a heavy base, cool unevenly and are especially prone to wet spots.
Pour when the wax turns cloudy and viscous, just about to set, into clean glasses warmed to about 40–50 °C. Cool them on a rack or wooden surface, not marble, at least 10 cm apart and away from drafts.
What to do
- To fix existing spots, warm the glass with a heat gun from about 15 cm, moving from bottom to top while rotating the glass.
- Stir fragrance in slowly for 2–3 minutes without whipping in air.
Source: The Big Book of Sweet Dessert Candles — "Wet Spots" / Candle Adhesion · Reminder: Preventing Wet Spots