Cured ArtResin can handle heat up to 120°F (50°C).
For everyday use, that's not a problem — think a cup of tea or coffee on a coaster or artwork displayed indoors.
In this blog, we'll take a look at what could happen when temperatures rise above this.
Can a Hot Cup of Tea or Coffee Damage Cured Resin?
Typically, no. A very hot mug placed on a resin coaster may temporarily soften the resin surface and, in some cases, you may notice a slight impression where the mug was sitting. This is normal. As the resin cools, it hardens again and the impression disappears.
What Heat Can Do to Cured Resin
In moderate heat, cured resin may become temporarily soft or flexible. This temporary softening doesn't damage the resin on its own.
You might notice this if:
- A resined piece sits in direct heat, like in a sunny window
- A very hot mug is left on a coaster
- Artwork is displayed outdoors on a very hot day
Once things cool down, the resin will firm back up again.
When to Be Careful
While softened resin will typically recover as it cools, it's more vulnerable to dents and impressions while it's warm.
For example, if resin artwork is stacked, leaned against other pieces, or has objects resting on it during hot weather, those dents or marks may remain even after the resin hardens again.
We've even seen this with artwork packed in bubble wrap and exposed to heat. The surface becomes permanently marked.
💡TIP: Learn how we recommend wrapping artwork in our blog The Best Way to Pack Resin Art for Shipping.
For this reason, we recommend erring on the side of caution. Avoid:
- Transporting artwork in hot conditions
- Stacking or leaning pieces together
- Showing work outdoors in very hot weather or direct sunlight
- Placing very hot items directly on cured resin (such as items fresh from the oven)
What About a Piece Left in a Hot Car?
Never leave resined artwork inside a hot car — this is where temporary softening can become permanent damage.
Temperatures inside a parked vehicles can heat up fast in summer, far beyond ArtResin's recommended heat tolerance. These conditions can lead to warping, distortion and irreparable damage.
Need a Resin with Higher Heat Resistance?
If your project may be exposed to higher temperatures, it may be worth choosing a resin specifically formulated for those conditions.
Industrial Clear epoxy resin, ArtResin's sister brand, is offers heat resistance up to 190°F (88°C) once fully cured — making it a great choice for projects that may encounter more heat in everyday use.
In addition to its higher heat resistance, Industrial Clear cures to a hard, durable, water resistant finish that stands up to moisture, chemicals and daily wear. It's trusted by makers, DIYers and professionals alike for projects that demand long-lasting performance.
A Word to the Wise: Keep it Cool
ArtResin is designed for everyday use and can comfortably handle normal household conditions. But like any material, it has its limits.
• Avoid prolonged exposure to extreme heat
• Never leave resin art inside a hot vehicle
• Take extra care when displaying or transporting artwork in very hot weather
• If your project requires greater heat resistance, consider a resin specifically designed for higher-temperature applications, such as Industrial Clear.
A little caution goes a long way toward keeping your work looking beautiful for years to come!
☀️ Learn more about working with ArtResin during summer heat in our blog How Does Hot Weather Affect Resin?
ArtResin: Made For Artists, By Artists.
