How much resin for coasters
Coasters are the ideal first project: a flat mold, low depth and a fast result. The one thing people get wrong is the amount, and with small molds overpouring or running short really shows. Here are the grams by size, which resin to use and how to keep them bubble-free.
Resin per coaster and set
| Coaster | 1 pc | Set of 4 | Set of 6 |
|---|---|---|---|
| Round Ø9 cm · 0.5 cm | 39 g | 156 g | 234 g |
| Round Ø10 cm · 0.7 cm | 68 g | 272 g | 408 g |
| Square 10×10 cm · 0.5 cm | 62 g | 248 g | 372 g |
How to calculate resin for coasters
Each coaster is a very flat cylinder: face area times thickness. For a round one, area = π × (diameter / 2)²; for a square one, length × width. Multiply by the thickness in cm for the volume in ml and by density (~1.12 g/ml) for the grams. Add a 10 % margin, which is what the table figures already include.
Which resin to use
A crystal-clear coating resin like Artline Crystal: very transparent, fast-curing and made for thin layers in a silicone mold. Deep-pour resins are unnecessary at 0.5-1 cm and cure far too slowly. For a clean edge, use a mold with walls rather than pouring over a flat base.
Bubbles and finish
Work at 22-25 °C so the resin flows and releases air. Weigh both parts with a 1 g scale, mix slowly for 2-3 minutes and pass a torch at a distance right after pouring. Cure on a level surface, covered from dust.
Example: set of 6 coasters
- Shape
- round Ø10 cm
- Thickness
- 0.5 cm
- Volume/piece
- ≈ 39 cm³
- Pieces
- 6
- Mix (+10 %)
- ≈ 260 g
Note: At 0.7 cm thick the same set rises to ≈ 405 g: thickness matters more than diameter.
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Frequently asked questions
How much resin do I need for one coaster?
A round 10 cm coaster at 0.5 cm thick takes about 62 g of mix. At 0.7 cm it rises to ≈ 68 g. Multiply by the number of pieces for the set total.
Which resin is best for coasters?
A crystal-clear coating resin (Crystal type): very transparent and fast-curing, ideal for 0.5-1 cm layers in a silicone mold. Deep-pour resins are unnecessary at this thickness.
Do resin coasters handle hot mugs?
Epoxy resin handles moderate heat well, but a very hot mug can mark it. For boiling coffee, a thickness of at least 0.5 cm and a good-quality resin lower the risk.