Oil paint dries faster in a warm environment. The temperature in the room where your painting is drying should be at least 70 degrees Fahrenheit (21 degrees Celsius), but the warmer the better. A humidifier may be used to keep the air moist while reducing dust mites and insects that may otherwise cause irritation for those with asthma or other respiratory diseases.
As long as you don't let the temperature get below 50 degrees Fahrenheit (10 degrees Celsius) or above 120 degrees Fahrenheit (50 degrees Celsius), your oil paint will remain stable. However, if it gets too hot, it's possible that some chemical reactions might happen that would cause colors to run or layers to separate.
If you're using an electric heat lamp, make sure to select one that is designed specifically for paintings. These lamps are usually made of glass with metal fins attached and should be located in a position where they can reach all areas of your painting. They should be turned on for about 20 minutes per day during the time your oil paint is still wet.
Sunlight is very harmful to oil paints, especially when it comes into contact with their thin surfaces. The sun's rays break down the molecules that make up the paint film, causing it to lose its luster and possibly crack.
The optimal temperature for applying oil-based paint is between 40 and 90 degrees Fahrenheit. It ranges from 50 to 85 degrees for latex-based paints. Is it okay to paint outside if it's going to rain? In terms of humidity, the best drying will take place between 40 and 70 percent humidity. If you can adjust your heat source according to the desired temperature range, that will improve your chances of success.
If you plan to use a sprayer, choose a painting day with less than 50% cloud cover since aerosol cans need ventilation to work properly. You also need an unobstructed view of the sky so you can rinse the can after each color application.
Painting outside is easier said than done because weather can be unpredictable. If it's going to be hot out, you'll want to make sure you have a way to cool down quickly if needed. Also remember that hotter temperatures mean faster dry times for oil based paints.
There are many options available today for heating and cooling spaces quickly and efficiently. For example, if it's 100 degrees outside and you know you're only going to be away from home for an hour or two, then using an electric blanket is more efficient than opening up all the windows and letting in cold air. But if you have to evacuate immediately because of fire alarms, then you'll need something more portable that doesn't require any electrical power.
The sun hinders the paint from curing evenly. Certain paints, particularly latex, dry faster than others. More time between applications is required when painting in hot, sunny conditions. Even if the air temperature is optimum, direct sunshine raises the warmth of outside surfaces by 10 to 20 degrees. This accelerates the drying process and requires more frequent repainting.
Paint manufacturers design their products to be tolerant to a certain degree of moisture absorption during storage and use. Moisture affects the color-producing ingredients in the paint and can also cause corrosion if it is water based or oil based. Most paints will remain effective for several months after they are opened, but you should check the label on each bottle to make sure.
Paints differ in their reactions to heat and sunlight. Heat causes many materials to break down or change state, which can release toxic substances into the air. Sunlight does the same thing to most plastics, causing them to crack and peel. Painting exterior surfaces will always leave some sort of mark on your home, whether it's because of rust or moth damage. These marks should be repaired before you paint again to avoid problems with the finish.
The best way to keep out dust while allowing air flow is with a quality vent screen.
Heat exposure may drastically accelerate the drying process of your painting. The faster it dries, the higher the heat. Cooler air, on the other hand, will slow down the drying process (see my article on storing unused oil paint in the freezer).
Oil paints are naturally thin liquids. When they're dry, they're no longer fluid and cannot be re-wetted. That's why when you paint onto a dry surface, the first thing that usually happens is that some of the thinner bits of paint might run or be brushed off. However, if you want the whole thing to be completely dry before you move on to the next stage, you'll need to speed up the drying time.
The two main things that can make oil paintings heat-sensitive are temperature and exposure to light. Heat speeds up the drying process and increases the risk of damage to the paint layer. Light-sensitive oils should never be exposed directly to sunlight; instead, use an opaque cover when displaying your work. These precautions will keep your treasures safe for many years to come.