Buy some commercial paint hardener or dryer to dry paint in a hurry.
Drying oil painting in the sun.
To speed up the drying time you can turn on a.
Bugs will get stuck to it.
This will make your paintings dry in a day or two compared to a week.
Use an alkyd medium with your colors.
How to make your oil paintings dry quickly.
To minimize debris getting in but so that the air can flow through.
After that i embrace the slow drying time of oil paint rather than try to avoid it.
Also paint is slow to dry in a cold environment so a warm room is preferable.
A couple of other things to think about that.
Oil paintings need daylight.
This layer of paint dries quickly within 24 hours.
When i start an oil painting i will usually thin the paint using odorless solvent so that it becomes a thin wash with a watercolor like consistency.
6 mix your paint with a solvent like turpentine or liquin.
This process is demonstrated in the painting below.
However there is an important exception and that is when an old painting is suffering from discoloured or yellowing of the varnish layer.
I typically find this is not such a good method as the paint dries too.
Combine linseed oil with the paint on your palette.
Avoid extreme heat like hairdryers as this will only make the process worse.
Add absorbent materials such as sawdust or cat litter to the paint if there is more than just a little left.
As you may have guessed from the prior answers drying an oil painting in the sun is the wrong thing to do.
Sun thickened linseed oil is a created by exposing the oil to the sun to create a thick syrupy somewhat bleached oil with similar brushing qualities to stand oil.
Pour paint from a full can into other cans or containers a little in each so it dries quickly.
Not direct sunlight due to fading and too much darkness will cause it to yellow.
Pour some oil about an inch into a wide dish cover it with a propped up lid i e.
The sun will take away the color.
Stir it periodically to hasten drying.
In general i agree with what has been said so far its not a good idea to leave an oil painting in full sunlight for an extended period of time this will affect certain pigments.
Use alkyd white instead of normal white to mix with your oil paints.