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Resin coaster moulds

Updated: 23 October 2026

A resin coaster looks like the simple first project, and then it rocks on the table, sticks in the mould, or takes a white ring from a mug of tea. The mould sets the shape and the thickness. The resin you pour sets whether that shape survives heat. This page is only about resin coaster moulds in the [epoxy resin mould comparison](/hub/fillers-adhesives-and-sprays/epoxy-resin-mould): two holder sets, one deep-round sheet and a pair of shallow trays. Jewellery, word moulds and the LED geometric kit are the wrong job here. Prices and stars are from the amazon.co.uk saved listings on 19 October 2026. Products Compared did not lab-test heat or food contact. A qualifying purchase can earn a commission at no extra cost to you.

A resin coaster looks like the simple first project, and then it rocks on the table, sticks in the mould, or takes a white ring from a mug of tea. The mould sets the shape and the thickness.

Our top picks

ZMD ZMD 6-cavity deep round mould

Best overall

ZMD ZMD 6-cavity deep round mould
8.0/10about £7.59
View offer
LET'S RESIN LET'S RESIN 18-piece coaster moulds

Rank 2

LET'S RESIN LET'S RESIN 18-piece coaster moulds
8.8/10about £17.99
View offer
EPODA EPODA coaster moulds with holders

Rank 3

EPODA EPODA coaster moulds with holders
7.0/10about £13.99
View offer
On this page
  1. 1.What size you are actually casting
  2. 2.Holder moulds are a second pour
  3. 3.Hot mugs and dishwashers
  4. 4.Food-grade on the mould is not food-safe resin

What size you are actually casting

LET'S RESIN's 18-piece set at £17.99 states a finished coaster of about 3.4 inches, in round, square and octagon, with 4.5 from 2,399 reviews. The listing does not add a depth in millimetres. EPODA at £13.99 gives four round and four square coaster moulds plus two holders, 4.4 from 385, and states no cavity size. Reviewers found them a little smaller than expected. One square was not flat, so the coaster came out uneven. ZMD at £7.59 is the large one: six rounds the seller calls 4 inches across, 0.8 inch deep and about 165 ml each. A UK reviewer measured about 10 cm by 1.75 cm and called it oversized for a regular coaster. Skip that sheet for a thin mat. The listing says casting resin, not coating resin. simarro at £5.39 is the shallow opposite: rectangles at 19 × 14 × 1.2 cm and hearts at 5.5 × 5 × 0.9 cm, with no star line. The hearts are not coasters. The rectangles are trays.

Holder moulds are a second pour

A rack is another cavity, not a wooden stand that arrives finished. EPODA includes one round holder mould and one rectangular holder mould. LET'S RESIN includes three holder moulds among the 18 pieces. You cast the coasters, then the holder, often in a second session because the volume is different. The holder will copy any dent in that mould. EPODA's piece count is the trap. Bullets add up to ten moulds. Other fields say 8 pieces, 9 items and a 10-pack. If a holder is missing, the listing gave you the argument in advance. LET'S RESIN is clearer: 15 coaster moulds and 3 holders. The cover photo shows a pattern the plain cavities do not cast.
ZMD ZMD 6-cavity deep round mould

Testsieger

ZMD ZMD 6-cavity deep round mould
8.0/10about £7.59
View offer

Hot mugs and dishwashers

The silicone does not decide whether a mug marks the coaster. The cured resin does. Resin Pro's hot-drinks note says to use a heat-resistant resin, often to wait about 72 hours before hot use, and on their own system to keep a clear top layer of about 3 mm. Washed Ashore Crafts talks about roughly 70°C and says no dishwasher. Those figures belong to those sellers' resins. They are not a rating for EPODA, LET'S RESIN, ZMD or simarro. Nothing in these four listings documents a dishwasher cycle. LET'S RESIN's torch warning is about the mould, not the finished coaster: a heat gun may damage the silicone. Let the resin reach the cure on its bottle before you test a warm mug, and test one coaster you can afford to mark.

Food-grade on the mould is not food-safe resin

simarro's listing says food-grade silicone. That is the seller's wording about the mould material. There is no certificate in the file, and there are no shopper reviews. It does not make the cured resin, the glitter or a dried flower into a food-contact surface. Retained Regulation (EC) No 1935/2004, Article 3, expects materials intended to touch food not to transfer anything that could harm health or change the food. The Food Standards Agency's overview is the UK starting point. A craft listing does not meet that test by printing food-grade on the rubber. Craft Resin, writing about its own epoxy, says incidental contact rather than a migration test they hold. A coaster under a cold glass is not a chopping board or a child's plate. If you want to sell pieces as food-contact ware, you need a case for that resin, not a mould adjective.

Common questions

What size coaster do these moulds make?
LET'S RESIN states about 3.4 inches and no depth. EPODA states no millimetres; reviewers found one square not flat. ZMD states about 4 inches, 0.8 inch and 165 ml, measured by one reviewer at about 10 cm by 1.75 cm. simarro's rectangles are 19 × 14 × 1.2 cm.
Will a hot tea mug mark the coaster?
It can. Heat resistance belongs to the cured resin and to how long you waited, not to the silicone brand. Other UK sellers cite roughly 70°C and about 72 hours for their own systems. Use the limit on your resin bottle.
Does food-grade silicone mean I can serve food on it?
No. simarro uses food-grade for the silicone. The file has no certificate and no proof about cured resin. Food-contact rules look at the surface that touches food. Keep these casts as decoration unless your resin supplier documents food contact.
Can I put resin coasters in the dishwasher?
These listings do not say yes. Dishwasher heat and detergent are a harder test than a cold glass. A UK resin maker who discusses heat also says no dishwasher for their work. Follow your resin's care line.
Is the ZMD sheet too deep for a normal coaster?
For a thin mug mat, yes. About 165 ml and roughly 1.75 cm is a thick disc. It suits a paperweight-style round if you use casting resin, which is what the listing asks for. Coating resin in that depth is the pour the seller tells you not to do.
Why did one EPODA coaster rock?
Because one square mould in the UK sample was not flat, so the cast copied the warp. Dents and scratches do the same to the face. Check the empty mould on a flat table before you mix. A 4.4 from 385 does not flatten one warped cavity.

Related pages

How to use epoxy resin moulds

How to choose an epoxy resin mould

Best epoxy resin moulds

Epoxy resin mould

Resin mould kit vs moulds only: what is in the box

Sources

Public UK sources used for this comparison. amazon.co.uk prices, stars and review counts were taken from the listings on 19 October 2026.

  1. HSE skin sensitisers (retrieved 19 October 2026)
  2. HSE COSHH and skin exposure (retrieved 19 October 2026)
  3. HSE GB CLP (retrieved 19 October 2026)
  4. Regulation (EC) No 1935/2004 Article 3 (retrieved 19 October 2026)
  5. Toys (Safety) Regulations 2011 Schedule 5 (retrieved 19 October 2026)
  6. FSA food contact materials (retrieved 19 October 2026)
  7. Go Bespoke resin mould guide (retrieved 19 October 2026)
  8. Apex Resin silicone mould care (retrieved 19 October 2026)
  9. East Coast Fibreglass resin moulds (retrieved 19 October 2026)
  10. amazon.co.uk listings for the ten ASINs in this set (retrieved 19 October 2026)