Jesmonite® Candle Holders: How to Cast Them Safely at Home

Is Jesmonite® safe for candles?

Yes. Cured Jesmonite® base products (Jesmonite® base plus Jesmonite® liquid) are tested to withstand high temperatures and won’t melt, which makes them a genuinely good choice for candle holders and tealight holders, unlike many resins or waxed finishes. Note that this applies to the base material only, not to sealers, which are not fire-tested.

There is one rule that matters more than any other: a real flame should never sit directly against the Jesmonite® surface, and it should never touch decorative extras like dried flowers, glitter or inclusions. Always drop a proper metal or glass insert into the holder for a live flame, and keep the flame well clear of anything decorative. The insert catches drips, contains the heat, and keeps your piece looking good for years. Because sealers are not fire-tested, leave any surface a flame could reach unsealed; sealing such a surface is at your own risk.

Choosing a mould

The shape you pour into decides the whole look, so start there. Browse the dedicated candle holder moulds for shapes designed specifically for tealights and pillars. Many have a recess sized for a standard metal tealight cup, which saves you a lot of fiddling later.

If you want a wider selection or a matching set, the full mould collection includes trays, coasters and vases you can cast in the same colourway. Silicone moulds release cleanly and reproduce fine detail, which is exactly what you want for crisp edges on a small piece.

What you’ll need

• AC100 base powder and liquid, separately or as an AC100 starter kit, for indoor holders.
• A silicone candle holder mould.
• Accurate digital scales, mixing cups and a stir stick (a high-shear mixer on a drill helps for a lump-free mix).
• Optional pigments to colour the mix, plus any inclusions like terrazzo chips you make yourself from Jesmonite®.
• A metal or glass insert for the finished holder.
• Sandpaper and a sanding block for tidying edges, and a sealer if the piece will meet water.

If this is your first pour, an AC100 starter kit bundles the Jesmonite® base, Jesmonite® liquid and the basics in matched quantities so you don’t have to guess.

Step-by-step: casting a candle holder

1. Work out how much you need. For AC100, measure the volume of water needed to fill the mould, then add about 10% spare (some mix always stays in the cup). Divide that figure by 2 to get your Jesmonite® liquid amount, then multiply the liquid by 2.5 to get the Jesmonite® base amount. See our full guide on how much Jesmonite® you need.
2. Weigh the parts accurately. AC100 mixes at 1:2.5 by weight, one part Jesmonite® liquid to 2.5 parts base powder. Weigh on accurate digital scales and stick to that exact ratio.
3. Add liquid to powder and mix thoroughly. Combine until smooth with no lumps. If you’re colouring, add pigment now, a little at a time, since a small amount goes a long way.
4. Pour slowly. Pour in a thin stream from around 10 cm above the mould so trapped air can escape.
5. Release the bubbles. This is the main way to avoid air bubbles: after pouring, gently tap and vibrate the mould so trapped air rises to the surface, then pop any surface bubbles with a toothpick. For larger pieces or very detailed moulds, a vibration plate makes releasing bubbles even easier. Only for moulds with a lot of fine detail, you can first brush a thin layer into the cavity, but for most pieces this isn’t needed.
6. Demould at the right time. AC100 is ready to release after about 30 minutes. Leaving it in too long can make it sweat and mark the surface.
7. Sand early, then cure and seal. Tidy the edges with P150 sandpaper on a block as soon as you can after demoulding, while the cast is still relatively soft and easier to work. Then let the piece keep hardening; AC100 is fully cured after 24 hours. Jesmonite® is porous, so once it’s fully cured seal it before any contact with water, but leave any surface a flame could reach unsealed.

If a result comes out soft, chalky or sticky, it’s almost always the mix ratio or inaccurate scales. Too much Jesmonite® liquid gives a chalky cast; too little sets thick and fast. Weigh carefully and stick to the 1:2.5 ratio.

Tealight vs pillar vs dinner candles (use inserts)

The candle type decides the insert, and the insert keeps everything safe.

Tealights

Easiest of the three. Cast a recess sized for a standard metal tealight cup, or drop the cup into a plain well. The metal shell is your insert, so the flame never meets the Jesmonite®.

Pillar candles

Best set on a flat holder or a shallow dish with a heat-resistant plate or metal tray under the candle. A wider base gives stability and catches wax.

Dinner candles

Use a mould with a narrow bore, then line the bore with a metal candle cup or spike insert. Never let a tapered candle burn down onto the bare surface, and stop the candle well before it reaches the holder.

For stone-look or outdoor-friendly holders, cast in AC730 instead. It’s cement-based with a textured finish, mixes at 1:5 (Jesmonite® liquid to base), demoulds after about 4 hours, and suits both indoor and outdoor use. The water-volume rule above doesn’t apply to AC730, work out quantities with an online Jesmonite® calculation tool or the Jesmonite® app.

A no-wax option with CandleRoxx

Want a working candle without pouring or melting wax? CandleRoxx candle sand makes a candle in seconds: fill any heat-resistant holder with the sand and add a wick. It pairs perfectly with a cast Jesmonite® holder, and because you control how much sand goes in, one pot refills the same piece again and again. Keep the flame clear of any decorative extras, just as you would with a wax candle.

Ready to cast your first holder?

Pick a shape from the candle holder moulds, pair it with an AC100 mix or a starter kit, and you’ll have a handmade holder curing on the bench within the hour. Add an insert, seal it where it won’t meet a flame, and it’s ready to gift or keep.