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Why is my wax melt bubbling when burning?

Author

Mia Kelly

Published Jan 20, 2026

Another possible reason for the bubbles is that you waited a bit too long after melting the wax, and then you subsequently poured the wax into the moulds at a temperature that was far too low or even just a few degrees lower than what it should have been.

Why is my wax melt bubbling?

As the melted wax floats on the moisture the moisture is trapped at the bottom closest to the heat. Eventually when it gets too hot the water expands and floats to the top. This causes a bubble which pops when it reaches the surface and just like a bubble popping it spits some of the melted wax around the burner.

Why are my wax melts crackling?

Rough Surfaces/Cracking: Candles have an uneven, rough surface or small air bubbles which lead to small holes, cracking, and/or jump lines. Possible Causes: Stirring too vigorously, water somehow got into the wax, your candles cooled too fast, candles were poured at too cool of a temp.

Why is my wax melt steaming?

The white "smoke" you may sometimes see coming from your wax melt isn't actually smoke. It is in fact vapour, and is basically the fragrance oil evaporating. You will see it more with some fragrances than others and is nothing to be concerned about.

Why did my wax melt explode?

Since the hotter area of the candle is generally the center and the wax pool becomes a little cooler as it spreads out to the edge, the hot splattering water/wax, and fire combination reaches out towards the glass container causing the candle to break or “explode.”

34 related questions found

Can wax melts catch fire?

This is absolutely flammable because of the flame just like a regular candle. It's a fire hazard to leave this type of wax warmer unattended or turned on for extended amounts of time.

Why can't I smell my wax warmer?

This is because in a candle burner, the heat is more intense than an electric warmer, you will notice that the scent begins to fade away more quickly compared with electric warmers. Electric to warm, candle to burn is the quick way to think about it.

Should wax melts smoke when burning?

Why does my Wax Melt have Smoke / Vapour coming off it? None of our products can emit smoke. However sometimes when using the wax melts you may see vapour emitting from the wax – This is normal and is in fact the fragrance being released from the wax.

Can wax combust?

Candle wax, also called paraffin, is composed of chains of connected carbon atoms surrounded by hydrogen atoms. These hydrocarbon molecules can burn completely.

Why is my wax warmer smoking?

This is because it has still got its maximum amount of fragrance oil in the wax. The longer the wax is in the burner the more fragrance oil will be released and slowly you will notice less mist or smoke being emitted. But do not worry it is completely normal.

What happens if you get water in wax melts?

Try not to let any water enter the melting wax. Water is waxes worst enemy, and water in your melted wax will result with holes in your finished candles. If you do get water in your wax, or you notice water in wax; put your turkey roaster on the low setting and keep it uncovered.

What happens if you overheat soy wax?

Overheating soy wax by either pot or microwave will change the chemistry of the soy wax and may cause the soy wax to separate.

Why is my candle wick crackling?

This is the result of the candle consuming more wax than it can burn. Lighting a "mushroom" can lead a wick to crackle and pop and release soot into the air and onto your candle container.

How do you keep wax bubbles from melting?

The single best way to avoid getting air bubbles in your glass jar candles is to make sure to pre-heat your glass jars to about 160 degrees before pouring your candle wax into them.

How do you stop air bubbles in wax melts?

Avoid over-stirring which can produce air bubbles. Pour at a slightly hotter (+5°F) temperature. Heat your containers to 90-100°F in a warm oven. Pour more slowly.

What happens if you put too much fragrance oil in a candle?

Add too much fragrance: Using more fragrance oil does not always guarantee a stronger scent throw. Each wax has a recommended fragrance oil load and going beyond that limit can cause the fragrance oil to separate from the wax which could be a potential fire hazard (not to mention the ugly "gooey" spots it can create).

What happens to wax when it burns?

When a candle burns, the hydrogen and carbon from the wax combine with the oxygen in the air to become carbon dioxide and water vapor. Most of the matter in the candle ends up as these two gases.

How do you stop a wax fire?

Fire experts say if you do have a wax fire in your home, a dry chemical extinguisher or baking soda should be used to suffocate the flames.

At what temperature does wax ignite?

Yes, highly-flammable paraffin wax generally ignites at the following temperatures, depending upon its melting point, and the hardeners you mix into it: Paraffin wax without additives: 199°C (390.2°F). Paraffin wax with additives: 249°C (480.2°F).

Do wax melts evaporate?

Wax melts have also been proven to save money and last longer than a standard 16-oz. candle. Unlike candles, the wax does not evaporate; only the scent dissipates. Once you can no longer smell the fragrance, you can throw away your used wax and start a new scent.

Are wax melts safe for dogs?

Many high street wax melts are not pet safe

Ingredients such as Paraffin Wax, Lead, Benzene, and artificial scents can all have a detrimental effect on our dog's health. They can cause damage to their central nervous system and can trigger respiratory problems.

Why isn't my wax melt melting?

Look for drafts. Drafts from windows, fans, vents or air returns can greatly affect the way your warmer melts the wax. Move it to a different location if you suspect drafts may be the problem. This is another common reason why wax doesn't melt the way it used to.

How often should you change wax melts?

Melted wax does not evaporate; only the scent dissipates, so make sure to remove the used wax from your warmer before adding a new cube If using Happy Wax melts, 2-3 wax melts generally yield about 8 hours of fragrance. You are welcome to reuse the wax as many times as you want until the fragrance dissipates.

How many times can you melt a wax melt?

How many times can you reuse wax melts? According to Happy Wax, two or three wax melts provide about 8 hours of fragrance. Different brands have different burn times, but most fall within the 6-8 hours range. Many people find they can reuse the same wax melts several times before the scent slowly disappears.

Is it safe to leave a plug in wax warmer on all night?

Electric wax warmers can be left on for up to 10 hours or until the wax melt has stopped giving off fragrance.