Which candle molds should you use, and how do you get the candle out?
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Metal molds (usually aluminum) are durable and give a smooth, sometimes glossy finish; polycarbonate molds are clear, so you can watch the wax set, and give a shiny surface but scratch; silicone molds flex and release complex shapes. With a wax made for molding, you often need no mold release at all: CandleScience used none in its pillar and votive tests and the candles came out easily. A candle that sticks usually points to the wax (too soft or not made for molds), a damaged mold, or a candle removed before it has shrunk. This page compares the three mold types, explains when release helps, and diagnoses sticking.
The three common mold materials
| Metal (aluminum, tin plate) | Polycarbonate (rigid clear plastic) | Silicone (flexible rubber) | |
|---|---|---|---|
| Shapes | Round, square and hexagonal pillars; votive cups; taper tubes | Round and square pillars, some shaped designs | Almost anything, including textured and sculpted shapes |
| Finish | Smooth; the finish copies the mold's inside surface | Glossy where the wax touches the plastic | Copies texture; matte or satin unless the silicone is polished |
| Seeing the wax set | No | Yes | Mostly no |
| Heat | Conducts heat quickly, so the outside of the candle sets fast | Insulates more than metal | Insulates; thick molds hold heat |
| Durability | Long life if not dented; dents and scratches show on every candle | Scratches and can crack if dropped or stressed | Tears at thin edges; can distort if overheated |
| Releasing the candle | Slides out once the wax has shrunk | Slides out once shrunk; never pry with metal | Peel the mold back from the candle |
| Wicking | Hole in the base, or a wick pin | Hole in the base | Usually a hole or slit; some are wicked after release |
Two of the CandleScience Lab Notes describe the molds they used: pillar molds with wick pins and metal votive cups with wick pins for MP-137 [1], and pillar molds with wick pins for IGI 6028 [2]. A wick pin is a metal rod that stands in the mold while the wax sets, leaving a channel; the wick goes in after release. CandleScience noted the votive wick pins pulled out with little resistance [1].
The USDA Agricultural Research Service's beeswax note lists molds "from metal tapers to plastic" shapes, and suggests standing molds in a tray of sand while you pour, so they stay upright and spills do not reach the table [3]. That is good practice with any mold.
Check the mold's temperature rating
None of the sources cited here gives a mold maker's heat rating, so this page gives none. Compare your mold maker's stated maximum with the hottest wax you will pour into it, including the second pour: CandleScience made MP-137's second pour at 190°F (87.8°C) [1]. A plastic or silicone mold rated below your pour temperature can warp, cloud or soften. If the maker publishes no rating, ask before you buy.
When you need mold release, and when you do not
Mold release is a thin coating (usually a silicone spray) that keeps wax from bonding to the mold. Whether you need it depends far more on the wax than on the mold.
| Situation | What the sources say | What to do |
|---|---|---|
| Pillar paraffin in a smooth pillar mold | CandleScience used no release for MP-137, IGI 6028 or IGI 1239 pillars; all released easily or very easily [1] [2] [4] | Try without release first |
| Votives in metal cups | MP-137 and IGI 6028 votives released easily without release [1] [2] | Try without release first |
| Tart and clamshell molds | IGI 6028 and IGI 1239 tart molds were somewhat resistant, and CandleScience says a release "would be useful" [2] [4] | Use release for tarts and detailed shapes |
| A self-releasing pillar blend | Supplies for Candles calls Kerawax 4600 "self releasing," with silicone spray if it sticks, and chilling the mold briefly if release is still difficult [5] | Start without; spray if a mold proves sticky |
| Vegetable pillar wax | Cargill's patent describes its pillar and votive wax as formulated to release from molds [6] | Use a wax made for molding; container soy wax is not |
| Detailed or textured molds | Dadant describes treating a mold before use so details come out intact and bits of wax do not stick [7] | Use release on molds with fine detail |
Release sprays are sold for several mold materials. Lehman's lists its spray for aluminum, polycarbonate, polyurethane, acrylic and silicone molds [8]. Follow the spray maker's instructions for how often to reapply.
How to apply it:
- Start with a clean, dry, room-temperature mold.
- Spray a light, even coat and wipe or let excess drain out. Pooled release leaves marks and pits on the candle.
- Let it dry before pouring.
- Do not spray near a flame or a hot plate; aerosol sprays are flammable unless the label says otherwise. Read the can.
- Release on the candle's surface can affect how a coating, label or overdip bonds. If you finish candles after molding, test the finish on a released candle.
Why a candle sticks, and what to change
| Likely cause | Signs | Fix |
|---|---|---|
| The wax is too soft for molding | Container wax or a low melt point wax in a pillar mold; candle sags or tears | Use a wax made for pillars or votives (see how to make a pillar candle) |
| Released too soon | Candle still warm in the center; mold walls warm | Wait until it has cooled completely; the shrinkage that frees the candle happens as it cools |
| Mold surface damaged | Scratches, dents or residue; candle sticks in the same spot every time | Retire or repair the mold; damage shows on every candle |
| Wax poured over the rim | A lip of wax locks over the mold edge | Fill only to the line; trim the lip before release |
| A detailed shape with no release | Tart, clamshell or textured mold | Use release [2] [4] |
| Fragrance oil on the surface | Candle feels oily after release | CandleScience found IGI 1239 candles felt oily after unmolding and the oil absorbed in 48 hours [4]; check the load is within the wax's limit |
If a candle will not come out at all, Supplies for Candles chills the mold and candle in the fridge for a few minutes [5]. Keep it brief. A long chill can crack the candle, which is a different problem.
Cleaning and storing molds
Clean molds while there is only a little wax to deal with, and never scrape with metal tools.
- Remove leftover wax gently. Warm the mold enough to soften wax and wipe it out with paper towel or a soft cloth. Keep wax out of the sink; Panduro's candle kit instructions warn not to pour wax down the drain [9]. Dry metal molds fully before storing.
- Remove old release when it builds up, following the spray maker's directions.
- Store molds so they keep their shape. Stand metal and polycarbonate molds upright and apart so they do not dent or scratch; lay silicone molds flat without weight on top.
- Keep wax for each mold type separate if colors differ. Residue from a dark candle can mark a light one.
Choosing your first mold
A single round metal pillar mold of the size you want to sell is the easiest way to learn pillars: it releases well, lasts for years and gives you a diameter to wick for. Votive cups follow naturally (see votives and tealights). When something goes wrong with the candle itself rather than the release, pillar problems covers cracks, voids and burn-through.
References
- CandleScience, Lab Notes: Paraffin Pillar Wax MP-137, undated (header image dated July 22, 2021), read October 22, 2026. https://candlescience.com/lab-notes-paraffin-pillar-wax-mp-137
- CandleScience, Lab Notes: IGI 6028 Paraffin Soy Pillar Wax Blend, undated, read October 22, 2026. https://www.candlescience.com/learning/lab-notes-igi-6028-paraffin-soy-pillar-wax-blend
- D. Sammataro, Making Candles with Beeswax, USDA Agricultural Research Service GEARS server, 2002 (archived copy in the Apache Tika govdocs1 corpus), read October 22, 2026. https://corpora.tika.apache.org/base/docs/govdocs1/021/021482.html
- CandleScience, Lab Notes: IGI 1239 Paraffin Wax, undated (images dated 2018), read October 22, 2026. https://www.candlescience.com/learning/lab-notes-igi-1239-paraffin-wax
- Supplies for Candles, Paraffin Pillar Blend Wax for Pillar Candle Making (Kerawax 4600 product page with instructions), updated October 22, 2026. https://www.suppliesforcandles.co.uk/?p=4368
- Google Patents, US6773469B2, Triacylglycerol based wax for use in candles (inventor Timothy A. Murphy; assignee Cargill, Inc.), granted August 10, 2004. https://patents.google.com/patent/US6773469
- Dadant & Sons, Silicone Release Spray (product page M03050), undated, read October 22, 2026. https://www.dadant.com/catalog/m03050-silicone-release-spray
- Lehman's, Candle Mold Release Spray (product page), undated, read October 22, 2026. https://www.lehmans.com/products/candle-mold-release-spray
- Panduro, Dipping wax and candle wicks, item 741021 (kit instructions, English), undated, read October 22, 2026. https://panduro.com/inspirationpdfs/741021_Stöpmassa_UK.pdf
