Why does my candle have wet spots?

What you see: pale patches where the wax has pulled away from the glass, looking like air bubbles trapped against the container wall.

Why it happens: the wax cooled at a different rate than the glass, or the glass was cold when you poured. It's shrinkage again — the wax contracts and lets go of the wall in spots.

The fix: honestly, there isn't a reliable one after the fact — it's cosmetic and doesn't affect how the candle burns. Prevention: warm your containers slightly before pouring (a warm — not hot — oven for a few minutes works), pour at the right temperature for your wax, and cool slowly at room temperature. Some waxes are just prone to it; soy is notorious.

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