If you have ever poured a candle that tunnelled straight down the centre, refused to throw its scent, or burned with an angry flame twice the size it should have been, you already know that candle making is more science than it looks from the outside.
I have been making candles for over 25 years. I owned two handmade gift stores where I crafted every product on the shelves myself — from cottage candles to elaborate food and drink replica candles that required precise formulation and hours of testing. These days I create natural and eco-friendly candles, but the fundamentals have never changed. What has changed is how many beginner candle makers have access to information that sounds right but skips the parts that actually matter.
This post is the one I wish had existed when I was starting out.
This post may contain affiliate links. If you purchase through my links I may earn a small commission at no extra cost to you. I only recommend suppliers and products I have personally used and trust.
Why Candle Making Mistakes Are So Costly
Candle making mistakes are not just frustrating — they can be expensive and, in some cases, genuinely dangerous for anyone considering starting a candle business . A single batch of candles uses consumable supplies that add up quickly. A poorly wicked candle can overheat a vessel and cause it to crack or shatter. Candles with incorrect fragrance loads can produce excessive soot, throw chemicals into your air, or simply underperform in ways that damage your reputation if you are selling.
The good news is that every mistake on this list is entirely preventable once you know what to watch for.
Mistake #1: Not Spending Enough Time on Wick Testing
This is the single most common and most consequential mistake beginners make, and it is the one most tutorials gloss over.
Wick testing is not optional. It is not something you do once with one candle and call complete. A proper wick test requires burning your candle in controlled conditions over multiple burn sessions — typically three to four — watching how the melt pool develops, how the flame behaves, whether the wick mushrooms, and how much soot is produced.
A wick that is too small creates tunnelling. A wick that is too large creates a dangerous oversized flame, excessive soot, and overheating that can crack or shatter your vessel. Both ruin the candle and both are avoidable with patient testing.
The variables that affect wick choice include wax type, vessel diameter, fragrance load, and fragrance oil viscosity. Change any one of those variables and you need to re-test. A wick that works perfectly in a four-inch diameter vessel with soy wax and a 10% fragrance load will not automatically work in the same vessel if you switch to a coconut-soy blend or increase your fragrance percentage.
What to do instead: Source a wick sampler pack that covers the range of sizes appropriate for your vessel diameter. Test each one using identical conditions and keep detailed notes. Document your melt pool depth, flame height, any mushrooming, and scent throw at one, two, and three hour marks. Only use a wick in a finished candle when it has passed three full burn test sessions..
Mistake #2: Using Thrifted or Unknown Glassware
This one matters for safety reasons and I cannot stress it strongly enough.
Thrifted glassware — mason jars from the dollar store, vintage vessels from estate sales, repurposed food jars — may look beautiful. They may even hold up through several burn cycles. But you have absolutely no way of knowing the thermal integrity of glass that was not manufactured and tested to candle standards.
Candle vessels are engineered to tolerate sustained heat exposure. The glass thickness, tempering process, and base construction are all designed to manage the heat transfer that happens during a long burn. Random glassware has none of those guarantees. Fine hairline cracks that are invisible to the naked eye can fail catastrophically when heat is applied. A shattering candle vessel spills molten wax, which is a serious fire risk.
This is especially important if you are making candles to sell or give as gifts. The liability falls on you.
What to do instead: Source your vessels from reputable candle supply companies that sell glassware specifically manufactured for candle use. Yes, it costs more. It is non-negotiable.
Mistake #3: Adding Botanicals, Dried Flowers, or Combustible Decorations on Top
Dried lavender on the surface of a candle looks stunning in a product photo. It is also a fire hazard.
Dried plant material is combustible. When a flame reaches a dried flower petal or a sprig of herbs sitting directly on or near the wax surface, it can catch fire. This is one of the most common ways decorative candles cause house fires.
The aesthetic trend of botanically-decorated candles has led a lot of beginners to believe this is a standard and accepted practice. It is not, and most reputable candle safety guidelines explicitly advise against it. Now let me be fully transparent here, I do use some but it is a little sprinkle not an entire plant! These are meant accent or add spiritual properties not an entire bouquet with dried stems that can easily start a fire!
What to do instead: If you want botanical or floral aesthetics, embed botanicals in the wax below the surface rather than on top, ensure they are well below the burn pool line, or use crystallized wax textures and botanically-inspired fragrance blends to achieve the visual and sensory effect without the combustion risk. Always include appropriate safety warnings on your labels regardless.
Mistake #4: Ignoring Fragrance Load Limits
Every wax has a maximum fragrance load — the highest percentage of fragrance oil it can fully bind with and hold safely. Exceeding that load does not make your candle smell stronger. It makes your candle unsafe.
Fragrance oil that has not fully bonded with the wax can pool on the surface or seep out of the candle over time. That pooled fragrance oil is flammable. If it collects near the wick or on the wax surface, it can flash and cause an oversized, uncontrolled flame.
Equally, under-loading fragrance produces candles that have almost no scent throw once burning — a common complaint from beginners who assume candle making is as simple as adding some oil to melted wax.
What to do instead: Always follow the fragrance load specifications provided by your wax manufacturer. Use a candle making calculator to determine the precise amount of fragrance oil for your batch size and chosen wax type. Common ranges are 6% to 12% depending on the wax, but always verify with your specific supplier data sheet.
Mistake #5: Skipping a Candle Making Calculator
Candle making by eyeballing measurements is how beginners waste entire batches and create inconsistent results they cannot replicate.
A candle making calculator takes your vessel volume, your wax type, and your desired fragrance load percentage and tells you exactly how many grams or ounces of each component you need for a given batch. It removes the guesswork entirely and means your results are repeatable.
Free candle making calculators are available from most major candle supply companies.
What to do instead: Use a calculator for every single batch without exception. Record your results. When a batch performs well, you have a formula you can reproduce exactly.
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[GET THE FREE SUPPLIER LIST]
Mistake #6: Choosing the Wrong Wax for Your Application
Not all wax behaves the same way and the wax that works beautifully in a container candle will perform very differently — or fail entirely — as a pillar or a votive.
Soy wax is popular for container candles because of its clean burn and excellent scent throw, but it is notoriously difficult to use for freestanding candles because of its soft texture. Paraffin has a higher melt point and is better suited to pillars and molded candles. Beeswax burns slowly and cleanly but requires specific wick sizing and behaves differently at room temperature than soy or coconut blends. Coconut wax is luxurious but has a very low melt point that makes it sensitive to shipping temperatures.
What to do instead: Research your specific wax before purchasing and confirm it is appropriate for your intended candle type. Read the manufacturer data sheet, not just the product listing description.
Mistake #7: Not Accounting for Fragrance Flashpoint
Fragrance oils have a flashpoint — the temperature at which the oil can ignite when exposed to flame or spark. If you add a fragrance oil to wax that is still too hot, you can cause the fragrance to burn off before it binds to the wax, which ruins your scent throw. In extreme cases it can cause a flash fire.
Most candle making recipes specify an “add fragrance at” temperature, typically somewhere between 160°F and 185°F depending on the wax and the fragrance. This is not a suggestion. It is a formulation requirement.
What to do instead: Always know the flashpoint of every fragrance oil you work with. This information is in the Safety Data Sheet (SDS) for each fragrance. Add fragrance below the flashpoint of that specific oil, not at a generic standard temperature you found in a beginner tutorial.
Mistake #8: Pouring at the Wrong Temperature
Pour temperature affects almost everything: adhesion to the vessel walls, surface finish, sinkholes, and how evenly the fragrance disperses through the wax.
Pouring too hot causes the candle to shrink away from the container walls as it cools, leaving visible gaps. It can also cause excessive frosting on soy wax. Pouring too cool means the wax begins setting before it fully levels, resulting in uneven tops and inconsistent scent distribution.
What to do instead: Use a dedicated candle making thermometer and follow the pour temperature recommendations for your specific wax. Do not rely on touch or visual estimates.
Mistake #9: Skipping the Cure Time
Candles need time to cure before they perform at their best. Curing allows the fragrance oil to fully bond with the wax at a molecular level, which significantly affects cold throw (how strong the candle smells when unlit) and hot throw (how strong the scent disperses while burning).
Most candle makers recommend a minimum cure time of 48 hours, but soy candles in particular benefit from a full two-week cure for optimal scent performance. Burning a candle immediately after it has set is one of the most reliable ways to produce a disappointing result and incorrectly conclude that your fragrance load or wick size is wrong.
What to do instead: Build cure time into your production schedule. Never burn-test or sell a candle that has not reached the recommended cure time for your wax type.
Mistake #10: Buying Fragrance Oils Without Checking Candle Compatibility
Not all fragrance oils are formulated for candle use. Fragrance oils made for soap, lotion, or room sprays may not behave correctly in wax — they can discolour, separate, cause wicking issues, or fail to throw scent properly.
Similarly, some fragrance oils contain skin-safe components that behave unpredictably when burned. The combustion chemistry of a candle is different from the direct skin contact chemistry of a soap or lotion.
What to do instead: Purchase fragrance oils from suppliers that specify candle compatibility and provide usage rates and SDS documentation for candle applications. Do not substitute fragrance oils across product categories without research and testing.
Mistake #11: Underestimating the Importance of Professional Labels
If you are making candles to sell, your label is not just branding — it is a legal requirement and a safety document.
In Canada, candle labels must include the product name, any hazard warnings required under WHMIS/GHS guidelines, burning instructions, and contact information for the maker. Labels that are missing required safety information expose you to liability.
Beyond compliance, a poorly designed label immediately signals amateur production to buyers. In a market flooded with handmade candles, professional labeling is one of the few things that visually communicates quality before a customer ever smells your product.
What to do instead: Research the labeling requirements for your province or country before you sell a single candle. Design your labels in Canva using a consistent brand template. Use a label printing service that produces waterproof, heat-resistant labels appropriate for candle vessels.
Mistake #12: Using Synthetic Dyes That Are Not Candle-Safe
Craft store dyes, food colouring, crayons, and many non-specific colourants do not behave predictably in candle wax. Crayons in particular are notorious for clogging wicks because they contain pigments rather than dyes — the pigment particles do not dissolve in the wax and accumulate on the wick over time, causing uneven burning and potential extinguishing.
What to do instead: Use only dyes specifically formulated for candle wax. Liquid candle dyes and dye chips from dedicated candle supply companies are formulated to dissolve cleanly and behave consistently through repeated burn cycles.
Mistake #13: Working Without Proper Ventilation or Safety Equipment
Melting wax produces fumes. Fragrance oils — even natural ones — release volatile organic compounds during the candle making process. Spending hours in a poorly ventilated space working with these materials is a health concern that many beginners do not consider until they notice persistent headaches or respiratory irritation.
Beyond fumes, working with heat sources, open flames for testing, and hot poured wax requires basic safety equipment and awareness.
What to do instead: Work in a well-ventilated space. Use a dedicated thermometer and pouring pitcher — never use microwave vessels or random kitchen equipment that can compromise temperature accuracy or contaminate food surfaces. Keep a fire extinguisher accessible in your workspace. Never leave melting wax unattended.
Mistake #14: Not Keeping Batch Records
If you make a candle that performs perfectly — beautiful cold throw, even melt pool, clean burn, great hot throw — and you did not write down exactly what you used and how, you cannot reproduce it.
This is especially critical if you are building a candle business. Consistency is what turns a one-time customer into a repeat buyer. Your bestselling scent needs to smell and burn exactly the same every single time.
What to do instead: Keep a dedicated candle making journal or spreadsheet. Record every variable: wax type and supplier, wax weight, fragrance name and supplier, fragrance percentage and weight, dye type and amount, wick size and brand, pour temperature, room temperature, cure time, and burn test results. Every batch, every time.
Mistake #15: Rushing to Sell Before You Have Tested Thoroughly
This is the mistake that costs beginners the most — in money, in reputation, and sometimes in safety.
The excitement of making candles that look and smell beautiful is real. But a candle that has not been thoroughly tested across multiple burn sessions is an unknown quantity. You do not yet know how the full melt pool develops in hours three and four. You do not know how the wick behaves as it approaches the bottom of the vessel. You do not know if the vessel heats to a safe temperature throughout the entire burn.
In many jurisdictions, selling a product you have not adequately tested for safety creates legal liability. For home-based candle businesses, product liability insurance is not optional once you are selling — and most insurers want to see evidence of testing protocols.
What to do instead: Complete a minimum of three full burn test cycles per candle formula before selling. Test in the conditions your customer will most likely use the candle in — not just optimal lab conditions. When the candle performs consistently and safely across all test burns, it is ready to sell.
I have also created a list of trusted supplies you can buy on Amazon.
https://jenniferdawn.ca/wp-content/uploads/2026/06/custom-luxury-candle-labels-1.mp4