15 Common Candle Making Mistakes (and How to Fix Them)

Candle making looks simple — melt wax, add fragrance, pour, done. But anyone who's actually made candles knows the reality: there are dozens of variables that can go wrong. Temperature, fragrance load, wick size, cure time, pour speed… each one matters.

The good news? Most problems have straightforward fixes. Here are the 15 mistakes we see most often and how to solve each one.

1. Pouring at the Wrong Temperature

The mistake: Pouring wax that's too hot or too cold.

This is the #1 beginner mistake. Pour too hot and you get sinkholes, frosting, and poor glass adhesion. Pour too cold and you get rough tops, air pockets, and uneven surfaces.

The fix:

• Soy wax (464): Pour at 120–140°F (49–60°C)
• Soy wax (444): Pour at 120–140°F (49–60°C)
• Coconut wax blends: Pour at 100–120°F (38–49°C)
• Paraffin: Pour at 150–175°F (66–79°C)
• Always use a thermometer — don't guess
• Preheat your containers to 90–100°F to reduce temperature shock

Need exact temperatures for your wax type? Try our free temperature guide.

2. Sinkholes Around the Wick

The mistake: After your candle cools, you notice a gap or crater around the wick.

Sinkholes form when wax shrinks as it cools. All wax shrinks, so sinkholes are completely normal — the trick is dealing with them.

The fix:

• Poke relief holes around the wick after the first pour starts to set (when the surface is firm but still warm)
• Do a second pour at the same temperature as the first
• Use a heat gun to smooth the top after the second pour
• Pour at a lower temperature (closer to the recommended range)
• Cool candles slowly — avoid fans, open windows, or cold rooms

3. Wet Spots on Glass

The mistake: You see what looks like wet patches where the wax has pulled away from the glass.

Wet spots are purely cosmetic — they don't affect burn performance. They happen when wax shrinks unevenly and loses adhesion to the container wall. Every candle maker deals with them, even professionals.

The fix:

• Preheat containers to 100–120°F before pouring
• Pour at the lower end of your temperature range
• Cool candles as slowly as possible (room temp, no drafts)
• Try a different wax — some formulas adhere better than others
• Accept some level of wet spots as normal, especially with soy

Pro tip: If you sell at craft fairs, use opaque or colored containers to hide wet spots entirely.

4. Poor Hot Throw

The mistake: Your candle smells great in the jar but barely scents the room when lit.

Hot throw is the #1 complaint from customers and the #1 frustration for candle makers. Multiple factors contribute.

The fix:

• Add fragrance at the right temperature: Usually 180–185°F (82–85°C) for soy. Too hot and fragrance molecules evaporate. Too cool and they don't bind.
• Stir thoroughly: 2 full minutes of continuous stirring. Not 30 seconds.
• Check your fragrance load: Most soy waxes can handle 8–10%. If you're at 6%, that might be why.
• Cure longer: Soy candles need at least 1–2 weeks to develop full scent throw
• Check your wick size: A wick that's too small creates a small melt pool, which means less fragrance is released
• Try a different wax: Coconut and paraffin generally have better hot throw than soy

Not sure how much fragrance to use? Our fragrance calculator does the math for you.

5. Tunneling

The mistake: The candle burns straight down the middle, leaving a wall of unmelted wax around the edges.

Tunneling is almost always a wick problem. The wick is too small for the container diameter, so it can't create a full melt pool.

The fix:

• Size up your wick — you need a full melt pool (edge-to-edge) within 2–3 hours of lighting
• First burn matters most: burn the candle long enough on the first use to establish a full melt pool. Wax has "memory"
• For existing tunneled candles: wrap aluminum foil around the top to reflect heat inward

Unsure which wick to use? Check our wick size guide for recommendations by container diameter.

6. Frosting on Soy Candles

The mistake: A white, crystalline coating appears on the surface or sides of your soy candle.

Frosting is a natural characteristic of soy wax — it's actually proof your candle is made with real soy. It happens when the wax tries to return to its natural crystalline state.

The fix:

• Pour at a lower temperature (120–130°F for most soy waxes)
• Cool slowly and consistently — no temperature fluctuations
• Some soy wax formulas frost less than others (464 frosts more than some blends)
• Add a small percentage of coconut or paraffin to reduce frosting
• Or embrace it — many customers see frosting as a sign of a natural, quality product

7. Wrong Wick Size

The mistake: Choosing a wick based on guesswork instead of testing.

The wick controls everything: melt pool size, burn time, hot throw, flame height, and safety. Getting it wrong leads to tunneling (too small), sooting (too large), or safety hazards (way too large).

The fix:

• Start with manufacturer recommendations for your container diameter
• Always test 3 wick sizes: one recommended, one up, one down
• Do full burn tests (not just lighting for 10 minutes)
• The goal: full melt pool within 2–3 hours, flame height of 1–1.5 inches, no excessive sooting

Get started with our wick size guide — it recommends wicks based on your exact container diameter and wax type.

8. Too Much (or Too Little) Fragrance Oil

The mistake: Adding fragrance by eyeballing instead of measuring.

Too much fragrance oil can cause "sweating" (oil seeping to the surface), wick clogging, poor burn performance, and safety issues. Too little means weak scent throw.

The fix:

• Use a digital scale — always measure by weight, never by volume
• Typical fragrance loads: 6–10% for soy, 6–12% for paraffin
• Check your wax's maximum fragrance load (it varies by formula)
• Start at 8% and adjust based on testing
• More fragrance ≠ better scent. There's a point of diminishing returns

Calculate the exact amount with our fragrance load calculator.

9. Not Curing Candles Long Enough

The mistake: Lighting or selling candles the day after you make them.

Cure time allows the fragrance oil to fully bind with the wax. An uncured candle will have significantly weaker hot throw compared to the same candle after a proper cure.

The fix:

• Soy wax: Cure 1–2 weeks minimum
• Coconut wax: Cure 1–2 weeks
• Paraffin: 24–48 hours is usually sufficient
• Store in a cool, dark place with lids on during curing
• Test your candles at different cure stages to find the sweet spot

Pro tip: Make candles at least 2 weeks before a craft fair. Your scent throw will be noticeably stronger.

10. Rough or Bumpy Tops

The mistake: Your finished candle has an uneven, cratered, or rough surface.

The fix:

• Pour at a lower temperature
• Pour slowly and steadily — don't splash
• Use a heat gun on low to smooth the surface after the candle has set
• For a perfect top every time: do a second pour, then smooth with a heat gun
• Make sure your workspace isn't drafty

11. Cracking

The mistake: Cracks form on the surface or through the body of the candle as it cools.

Cracking happens when candles cool too quickly. The outer layer solidifies and contracts while the inside is still liquid, creating stress fractures.

The fix:

• Cool candles slowly — cover with a towel or box to insulate
• Avoid cold rooms, air conditioning, or open windows
• Pour at the recommended temperature (not too hot)
• Preheat containers to reduce thermal shock

12. Wick Drowning in Wax

The mistake: The wick flame gets smaller and smaller until it drowns in the melt pool.

The fix:

• The wick is too small — size up
• The fragrance load might be too high, clogging the wick
• Make sure the wick is centered and straight — a leaning wick creates an uneven melt pool
• Trim wicks to ¼ inch before each burn (too long = mushrooming, too short = drowning)

13. Mushrooming Wicks

The mistake: A carbon ball forms at the top of the wick, creating a large, flickering flame.

The fix:

• Trim the wick to ¼ inch before every burn
• If mushrooming happens quickly (within 1–2 hours), the wick may be too large
• Some wick types mushroom more than others — zinc and paper core wicks mushroom less than cotton
• High fragrance loads can contribute to mushrooming

14. Not Tracking Your Recipes

The mistake: Making a great candle and having no idea how to replicate it.

This is the business mistake that costs you the most. If you can't consistently reproduce your best candles, you can't scale. Customers expect the same scent throw, burn time, and quality every time they buy from you.

The fix:

• Record everything: wax type, fragrance brand, fragrance load %, wick type and size, container, pour temperature, room temperature, cure time
• Take notes on each burn test
• Use a system you'll actually maintain — spreadsheets work until you have 50+ recipes

15. Skipping Burn Tests

The mistake: Selling candles you haven't fully burn-tested.

A candle might look perfect but perform terribly. Without a full burn test, you won't know about tunneling, sooting, drowning, or weak hot throw until your customers tell you — in a bad review.

The fix:

• Test every new combination of wax + fragrance + wick + container
• Burn for at least 4 hours per test (or until the candle is consumed)
• Check: melt pool coverage, flame height, soot, scent throw, burn time
• Keep written records of every burn test
• Don't sell anything that hasn't passed testing

Use our burn time calculator to estimate expected burn times, then compare against your actual test results.

Quick Reference: Fix Your Candle Problems