What Is the Ideal Temperature for Painting?

Short answer

The ideal temperature for painting is around 20–25 °C. It is important that not only the surrounding air, but also the part being painted, the paint or spray can and all materials used have a similar temperature. Painting in cold conditions, in direct sunlight or on a cold surface can significantly reduce the quality of the result.

Why is temperature important when painting?

Temperature affects how the paint behaves during spraying, how solvents evaporate, how the paint flows out, how each layer dries and how well the final system adheres. Even the correct product can produce a worse result if used at the wrong temperature.

With effect paints such as Chameleon, Candy, Pearl or Ghost Pearl, the correct temperature is also important for even distribution of effect pigments and a clean final appearance.

What can happen when painting in cold conditions?

At low temperatures, paint dries more slowly, solvents evaporate more slowly and the coating may not flow out properly. A spray can also has lower pressure, which can cause a rougher spray pattern, spitting or uneven application.

Typical problems when painting in cold conditions include:

• slower drying of the layers,
• poorer flow of paint or clear coat,
• a rougher surface,
• lower pressure in the spray can,
• higher risk of runs when applying thicker coats,
• poorer adhesion between layers,
• weaker final gloss.

Why should you not paint on a cold surface?

It is not enough for only the air in the room to be warm. If the part being painted is cold, the paint will not behave correctly on the surface. It may adhere poorly, flash off more slowly and create an uneven or matte result.

A cold part can be a problem especially in winter, in a garage, in storage or after moving the material from a cold environment. Before painting, it is best to allow the part, paint and spray can to reach room temperature.

What can happen at too high a temperature?

Too high a temperature is not ideal either. The paint may start drying too quickly while travelling from the nozzle to the surface. This can result in dry spray, a rough surface, poor flow or an uneven effect.

This problem can occur especially when painting in direct sunlight, on a hot part or in a hot and poorly ventilated area.

Is it suitable to paint in direct sunlight?

No. We do not recommend painting in direct sunlight. The surface may be much warmer than the surrounding air and the paint may dry too quickly. This can cause stains, a rough surface, poor flow or an uneven final shade.

It is best to paint in the shade, in a clean and well-ventilated area, without draughts, dust or direct sunlight.

How should the spray can or paint be prepared before painting?

The spray can, paint and the part being painted should have a similar temperature before application, ideally around 20–25 °C. If the spray can has been stored in a cold place, allow it enough time to warm up to room temperature before use.

Never heat a spray can directly on a heat source, on a radiator, with a heat gun or with an open flame. It is enough to let it warm up naturally at normal room temperature.

What minimum temperature do we recommend?

We do not recommend painting at temperatures below approximately 15 °C. The material may dry too slowly, flow out poorly and the final adhesion and appearance may be worse.

If you need to paint during colder weather, it is important to use a tempered space, a warm part and enough time for each layer to flash off and cure properly.

What else affects the result besides temperature?

• air humidity,
• ventilation and air movement,
• thickness of the applied layers,
• spray distance,
• cleanliness and preparation of the surface,
• flash-off time between coats,
• proper shaking of the spray can or mixing of the paint.

Summary

• The ideal temperature for painting is around 20–25 °C.
• The air, the part being painted and the material used should have a similar temperature.
• We do not recommend painting below 15 °C.
• A cold surface can cause poorer adhesion, slower drying and weaker gloss.
• Direct sunlight and excessive temperature can cause dry spray and a rough surface.
• Do not force-heat the spray can or paint; allow it to reach room temperature naturally.
• The best result is achieved in a clean, ventilated area without dust, draughts or direct sun.