Does Humidity or Temperature Affect Cratering?

How Humidity and Temperature Influence Resin Flow

High humidity can slow down the curing process and create an uneven surface, making it easier for craters to appear. On the other hand, when the temperature is too low, resin becomes less fluid and struggles to self-level, which can leave behind unsightly dimples and gaps. Always follow the product’s recommended working range—most resins and sprays are formulated for typical indoor conditions and may perform poorly outside these limits.

Practical Guidance for Reducing Cratering

• Work in a climate-controlled space whenever possible.
• Check the temperature and humidity levels before starting—a range of 18°C to 25°C and moderate humidity are usually ideal for most resin coatings.
• Avoid spraying or coating if the room feels damp or chilly, as this can encourage cratering.
• Let the surface and product acclimatise to the workspace temperature before use.

For instance, using a fast-drying finish such as the 2K Clear Coat Lacquer Aerosol Spray – 400ml High Gloss Finish can help minimise waiting times and provide a more even result, especially when environmental conditions are under control.

When This Matters Most

Cratering due to humidity and temperature is particularly relevant for detailed resin art, glossy finishing coats, or when working with textured and porous surfaces. Artists and DIY enthusiasts should pay close attention to these factors for gallery-quality results or outdoor sealing jobs. Choosing a product suited to the task—like a high-viscosity resin for art or a specialised concrete resin for floors—can also help reduce surface issues.