A wick that drifts off-centre can spoil an otherwise excellent pillar candle. Wick pins are a simple, dependable way to create a straight channel through a moulded candle, helping you position the wick accurately after the wax has set. Once you understand how to use wick pins, they can make moulded candle production cleaner, more consistent and easier to repeat.
Wick pins are most often used with pillar candle moulds, particularly moulds with a pre-drilled wick hole in the base. Instead of threading a wick through the mould before pouring, the pin occupies the wick hole while the wax sets. When the candle is removed, the pin leaves a neat passage for the wick.
What wick pins do in candle making
A wick pin is a slim metal rod, usually with a pointed end, designed to fit through the wick hole of a candle mould. It performs two jobs. First, it blocks the wick hole during the pour, reducing the chance of wax leaking from the mould. Second, it forms a channel through the finished candle so the wick can be threaded afterwards.
This is particularly useful for pillar candles, where keeping the wick central matters to both appearance and burn performance. A wick that is not properly centred may cause one side of the candle to burn down faster than the other, leave excess wax at one edge or create an unstable flame.
Wick pins are not generally needed for container candles. Containers are normally wicked before the wax is poured, using a wick tab, adhesive and a centring device across the top. Pins are a mould-making tool, so reserve them for suitable pillar, novelty and shaped candle moulds.
Choosing the right wick pin
The pin needs to be long enough to pass through the mould's wick hole and extend far enough into the mould cavity to create a complete wick channel. A pin that is too short may leave an incomplete channel, making it difficult to thread the wick later.
It should also be narrow enough for the mould hole. Do not force an oversized pin into a silicone, plastic or metal mould, as this can widen or damage the hole. If wax leaks around the pin, inspect both the pin and mould hole for wear, and check that the pin is sitting straight.
The finished channel needs to suit the wick you plan to use. A very fine pin may make threading a thicker wick difficult, while an unnecessarily wide channel can leave too much space around a narrow wick. There is no universal pin and wick combination, so test your chosen mould, wax and wick together before making a larger batch.
How to use wick pins step by step
Before starting, make sure the mould is clean, dry and fully assembled. Any moisture in the mould can affect the wax surface and, more importantly, create a safety risk when hot wax is poured.
1. Insert the pin through the mould base
Find the mould's wick hole. On many pillar moulds, this is in the base, which becomes the underside of the finished candle. Push the pointed end of the wick pin through the hole from the outside of the mould so that the pin extends into the candle cavity.
The pin should sit straight and securely. If it leans, the channel and finished wick will lean too. Check it from more than one angle before moving on.
Some mould and pin combinations form a close enough fit to prevent leaks on their own. With others, especially older or frequently used moulds, you may need to seal around the outside of the wick hole with suitable mould sealant. Use only a small amount. Excess sealant can be awkward to remove and may make it harder to release the pin later.
2. Prepare the mould and support the pin
Place the mould on a level, heat-safe surface. If the mould design allows the pin to protrude underneath, raise the mould slightly on a stable support so it sits level without putting pressure on the pin.
Check that the mould seam is secure if you are using a two-part mould. A wick pin can stop a leak at the wick hole, but it cannot compensate for a poorly closed seam. It is worth doing this check before heating and fragrancing your wax, rather than discovering a leak during the pour.
If you use mould release, apply it lightly and evenly according to the mould material and product instructions. Too much can affect the finished candle surface, while some silicone moulds may not require release at all.
3. Pour the wax at the right temperature
Melt, colour and fragrance your wax according to its recommended working temperatures. The best pour temperature depends on the wax type, fragrance load, colour and mould shape. For example, a wax that gives a smooth result in a simple round pillar may behave differently in a detailed mould with narrow sections.
Pour slowly, directing the wax against the inside wall of the mould where practical. This helps limit trapped air and reduces the chance of disturbing the wick pin. Keep the pin upright as you pour, particularly during the first few seconds when the wax is flowing around it.
Leave enough space for a top-up pour if your wax is prone to sinkholes. Pillar candles commonly need a second pour because wax contracts as it cools. Do not try to solve a sinkhole by moving the pin once the wax has started to set. That can enlarge the channel or mark the candle.
4. Allow the candle to cool completely
Let the candle cool naturally, away from draughts and major temperature changes. Rapid cooling can cause surface imperfections, cracking or excessive shrinkage, depending on the wax.
The candle must be fully set before you remove the wick pin. Pulling it too early can distort the channel, tear softer wax or make the pin difficult to extract. Cooling time varies with the candle diameter, wax and room temperature, but a larger pillar may need to rest overnight.
Patience at this stage pays off. A candle that appears firm on the surface can still be soft in the centre.
5. Remove the pin and release the candle
When the wax is completely cool, carefully pull the wick pin out of the mould. Pull it in a straight line rather than twisting aggressively or bending it sideways. If it resists, let the mould sit a little longer and try again. Forcing the pin can damage both the mould hole and the candle base.
Release the candle from the mould using the method suited to that mould type. Flexible silicone moulds can often be gently peeled back, while rigid pillar moulds may need the candle eased out carefully. Avoid pulling on the fresh wick channel or pressing hard around it.
You should now have a clean passage through the centre of the candle. Inspect it before threading the wick. If there is wax residue in the channel, use the pin gently to clear it rather than trying to push the wick through forcefully.
6. Thread and secure the wick
Cut a suitable length of wick, leaving extra length at both ends for handling. Thread it through the channel from the finished top of the candle towards the base. A wick threading needle or a fine wire loop can make this easier, especially with tall pillars or tightly sized channels.
Once the wick is through, secure it at the candle base using the method appropriate to your candle design. This may involve a sustainer, a small amount of wax or another suitable fixing method. The aim is to prevent the wick from pulling through during burning while keeping the base neat and stable.
At the top, pull the wick gently until it is straight, but do not pull so hard that it hollows the wax around the channel. Trim it to the recommended length for the wick and candle type. For many candles, around 5 mm is a sensible starting point, though always assess the finished candle and its wick specification.
Common wick pin problems and how to avoid them
Wax leaking from the wick hole usually means the pin is not seated tightly, the mould hole has worn wider or the outside needs sealing. Check the fit before every pour, especially when using a new mould or a different pin.
If the wick channel is off-centre, the pin was probably leaning when the wax set. Use a level work surface and confirm the pin is vertical before pouring. On unusually shaped moulds, it may help to support the mould in a holder so it cannot shift.
A blocked or narrow channel is often caused by removing the pin before the wax has fully hardened, using a pin that is too fine, or allowing wax to build up around the pin. Let the candle cool fully and select a pin that works with your chosen wick size.
If the wick is difficult to thread, do not enlarge the hole carelessly with a thick skewer or drill. This can leave a visible gap around the wick and affect the candle's finish. Try a wick needle first, or review whether your wick pin is suitable for the wick you have selected.
Test the finished candle, not just the moulding process
A straight wick channel is only one part of a well-performing pillar candle. Wax type, wick series, wick size, fragrance percentage, dye level and candle diameter all influence the burn. A wick pin helps you place the wick accurately, but it does not replace burn testing.
For candles you intend to sell, test each meaningful combination and record the results. Watch the flame, melt pool, mushrooming, smoking, burn time and the amount of wax left at the edge. Keep your test conditions consistent so you can make useful comparisons.
Wick pins are a small piece of equipment, but they bring useful control to moulded candle making. Take the time to match the pin to the mould and wick, allow the wax to cool properly, and treat every new wax and fragrance combination as a fresh test. That careful approach will help your pillar candles look more professional and burn more reliably.