Why is it important to maintain the correct temperature during painting?
Manufacturers specify mandatory application conditions – air temperature and humidity. Is this really important, and can temperature significantly affect the quality of the coating? We look for answers and draw conclusions.
Temperature Regime
Painting any surface is essentially a specific chemical reaction. If it occurs properly, a strong coating is formed. If not, the work will have been in vain.
The strength and durability of the coating directly depend on temperature and humidity. The optimal application temperature for most paints and varnishes is set between +5 °C and +35 °C.
What happens if the temperature is not within the norm?
Let’s look at the most common cases of conflict between materials and temperature.
- The ambient temperature is above the norm. The higher the temperature, the faster the applied coating dries and hardens. Too rapid drying leads to a strong film forming on the surface, which prevents the material from drying evenly in depth. Vapors remaining in the lower layers of paint will try to escape to the surface. This causes bubbles and pores to appear in the paint, and waves may form on the surface.
- The temperature of the coated surface is higher than the atmospheric temperature.
This is especially true when painting outdoors in summer, when all surfaces are strongly heated. Paint applied to such surfaces starts drying from within, due to the hot base. The outer layer remains viscous for a long time, dries unevenly, resulting in an irregular coating. - The ambient temperature is below the norm. Cold air and a cold surface lead to incomplete hardening of paint, possible uneven color, and weak adhesion to the surface. In addition, low temperatures are usually accompanied by increased humidity and condensation on surfaces, which also significantly hinders the formation of a strong film.
- The temperatures of paint and surface differ. For example, paint was stored in a cellar, while painting work is done in the evening on a warmed-up surface. Due to this temperature difference, condensation forms under the paint, causing poor adhesion to the surface. For proper application, both paint and what you are painting should have similar temperatures. Therefore, before painting it’s best to keep materials in the room where work will be carried out.
There are also special temperature conditions:
- application at low temperatures
- application on hot surfaces – radiators
There are special materials designed specifically for such temperatures and surfaces. Otherwise, the coating will simply run off or be ruined.
And although this may seem complicated, in reality it’s easy to carry out painting under proper conditions. The temperature range is wide; work is not limited to any particular season. The main thing is to apply material on a dry surface and follow the manufacturer’s recommendations for each specific material. If all conditions are met, you’ll get a smooth, durable coating ready for long-term service.