The best epoxy for coasters depends on whether you are filling a shallow mold or coating an existing blank. Our two picks are Alumilite Amazing Clear Cast in the 16-fl-oz kit for small molded projects, and TotalBoat MakerPoxy in the Quart Kit for thin decorative coatings and shallow resin work. Choose by pour depth, measuring method and full-cure requirements before comparing kit prices.
These recommendations compare manufacturer documentation and exact kit selections. They are editorial choices for different projects; we have not performed hands-on casting, heat, scratch or long-term yellowing tests.
Best epoxy for coasters: two kits to compare
| Exact pick | Best fit | Documented cure guidance | Main limitation |
|---|---|---|---|
| Alumilite Amazing Clear Cast, 16 fl. oz. total kit | A small batch of molded coasters within the manufacturer’s 3/8-inch maximum layer depth | Product page: typically 24–48 hours to demold; technical sheet: 3–5 days to full cure | The 130°F heat-deflection figure is not a guarantee that a finished coaster will tolerate a hot mug |
| TotalBoat MakerPoxy by Jess Crow, Quart Kit | Coating coaster blanks or making shallow decorative pieces within the listed 1/8–1/4-inch layer range | 4–6 hours tack-free for a 1/8–1/4-inch layer at 77°F; 5–7 days to full cure at 77°F | TotalBoat says not to place items hotter than 110°F on the cured surface |
Alumilite Amazing Clear Cast: best small kit for shallow molds
Choose the ordinary Amazing Clear Cast Epoxy, 16-fl-oz total kit, when you want a modest amount of resin for a small project. This is a two-part casting and coating epoxy. Alumilite specifies a maximum layer depth of 3/8 inch, which makes it a useful candidate for shallow coaster molds; check the actual cavity depth before buying.
Measure resin and hardener 1:1 by volume, as directed in Alumilite’s mixing instructions and product page. Its technical sheet also lists 1:1 “by weight or volume,” while the detailed mixing directions describe measuring equal volumes. This guide follows that volume method; check the instructions supplied with your kit and ask Alumilite if you need clarification before weighing it.
Plan beyond demolding. The product page gives a typical 24–48-hour demold window that varies with conditions and casting thickness; the current technical sheet lists 3–5 days for full cure. Its 130°F heat-deflection value is a material property, not a tested hot-drink rating for your finished coaster.
Why choose it: the 16-fl-oz total size is a reasonable starting point when you want to try a small project, and the documented 3/8-inch layer allowance gives more depth than MakerPoxy’s listed 1/8–1/4-inch range. Alumilite permits compatible pigment powders and liquid dyes, but says not to mix any oil- or water-based products with this resin; make a small compatibility sample before committing your project.
Trade-offs: the technical sheet says the resin can yellow over time and generally advises against outdoor applications. Cure timing and the specified measuring method also deserve attention. Skip this pick if you need a single pour deeper than the stated limit or a verified high-temperature coaster system.
Check the Amazing Clear Cast 16-fl-oz kit at Alumilite. Confirm the product name and total kit volume; Amazing Clear Cast Plus is a separate formula. Read the Amazing Clear Cast technical sheet alongside the instructions supplied with your kit.
TotalBoat MakerPoxy: best fit for thin decorative coatings
MakerPoxy is our pick for decorating coaster blanks and other shallow resin work. The Quart Kit contains one pint of resin Part A and one pint of hardener Part B. TotalBoat also lists ten stir sticks, ten 50-mL beakers and five 8-oz mixing cups with its Quart Kit, making it a useful option when you need mixing supplies as well as resin.
The ratio is 1 part resin to 1 part hardener by volume. TotalBoat’s instruction sheet separately specifies 100 parts resin to 84 parts hardener by weight; those are different measuring methods. The product’s listed layer range is 1/8–1/4 inch, and its ideal application temperature is 70–80°F.
At 77°F, TotalBoat lists 4–6 hours to a tack-free surface for a 1/8–1/4-inch layer, with 5–7 days to full cure. Do not treat a tack-free surface as ready for service. The manufacturer explicitly warns against placing anything hotter than 110°F on cured MakerPoxy because the surface can distort and discolor.
Why choose it: it is documented for coatings, small castings and resin art, and TotalBoat specifically includes coasters among its uses. The Quart Kit is a larger supply than the 16-fl-oz Alumilite kit. The separate volume and weight ratios are helpful if you want a documented choice of measuring methods.
Trade-offs: the shallow layer range and 110°F contact limit rule out treating it as an all-purpose deep-casting or hot-cookware resin. TotalBoat also says the UV-resistant formula is not intended for prolonged outdoor sunlight exposure. Choose it for the project fit, without assuming it will remain unchanged indefinitely.
Check the MakerPoxy Quart Kit at TotalBoat and review the MakerPoxy instructions and technical data. The smaller 8-oz and Pint Kits contain resin and hardener only, so do not assume that every size includes the Quart Kit’s mixing accessories.
How to choose epoxy for your coaster project
Start with the job: casting forms the coaster in a mold; coating adds a resin finish to an existing blank. Both products here can serve more than one use, but each has its own layer limits. A product described as “art resin” or “tabletop epoxy” still needs to match the depth and size of your specific project.
Compare the combined resin-and-hardener volume, not just the size of one bottle. Check your mold’s stated capacity, allow for your planned number of pieces and leave room in the budget for compatible molds, protective equipment and measuring supplies. A larger kit is only a better purchase if its usable amount suits your work.
Treat heat as a separate buying decision. MakerPoxy’s 110°F contact restriction and Amazing Clear Cast’s 130°F heat-deflection figure are different kinds of information and should not be ranked as equivalent temperature ratings. Neither establishes how a decorated coaster will behave under every hot mug. If hot-drink performance is essential, obtain the manufacturer’s confirmation for the finished system and intended contact conditions before choosing.
Read the exact product labels and current safety data sheets before opening either kit. Alumilite’s technical sheet calls for impervious gloves such as nitrile or butyl rubber, eye protection and adequate ventilation; TotalBoat calls for gloves, eye protection, protective clothing and a well-ventilated workspace, and warns that these products may cause allergic reactions. Avoid skin and eye contact.
Mixing epoxy generates heat. Both manufacturers warn about the cure reaction, and TotalBoat notes that larger batches generate more heat. Follow the product’s quantity, temperature and thickness instructions; do not turn a shallow-pour recommendation into an unrestricted deep pour.
Frequently asked questions
Which epoxy should I choose for a first coaster project?
For a small molded project within the stated depth limit, start by comparing Amazing Clear Cast’s 16-fl-oz kit with your mold capacity. For a thin decorative coating and a larger resin supply with mixing accessories, consider the MakerPoxy Quart Kit. The better choice depends on your project and the instructions you can follow.
Can I mix both epoxies by equal weight?
Do not assume that. MakerPoxy specifies 1:1 by volume but 100:84 resin-to-hardener by weight. Amazing Clear Cast’s mixing directions say 1:1 by volume, while a technical-sheet row also mentions weight; use the volume method or ask Alumilite to clarify before weighing it.
Is demolding the same as full cure?
No. Amazing Clear Cast’s product page gives a typical 24–48-hour demold window, while its technical sheet lists 3–5 days for full cure. MakerPoxy lists 5–7 days to full cure at 77°F. Actual conditions and the instructions for your kit matter.
Are these epoxies guaranteed safe for hot mugs?
No blanket hot-mug guarantee is supported here. TotalBoat says not to place items hotter than 110°F on MakerPoxy. Alumilite’s 130°F figure is heat deflection, not a finished-coaster use guarantee. Confirm the intended use with the manufacturer if hot-drink contact is a requirement.
Does a food-contact claim cover my decorated coaster?
Do not assume so. Alumilite’s product page conditions its incidental-food-contact statement on full cure and no additives. For a coaster made with pigments, inclusions or another finish, ask about the complete system. We make no general food-safe or non-toxic claim for either finished project.
