Oil paintings need daylight.
Drying oil painting in the sun.
Avoid extreme heat like hairdryers as this will only make the process worse.
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.
6 mix your paint with a solvent like turpentine or liquin.
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.
Use alkyd white instead of normal white to mix with your oil paints.
Use an alkyd medium with your colors.
Pour some oil about an inch into a wide dish cover it with a propped up lid i e.
Stir it periodically to hasten drying.
As you may have guessed from the prior answers drying an oil painting in the sun is the wrong thing to do.
Bugs will get stuck to it.
This layer of paint dries quickly within 24 hours.
I typically find this is not such a good method as the paint dries too.
Add absorbent materials such as sawdust or cat litter to the paint if there is more than just a little left.
Buy some commercial paint hardener or dryer to dry paint in a hurry.
The sun will take away the color.
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.
Pour paint from a full can into other cans or containers a little in each so it dries quickly.
To minimize debris getting in but so that the air can flow through.
One leave the painting to dry in a well ventilated open area where air circulates a fan helps.
Not direct sunlight due to fading and too much darkness will cause it to yellow.
How to make your oil paintings dry quickly.
A couple of other things to think about that.
To speed up the drying time you can turn on a.
Since linseed oil dries faster than other kinds of oil mixing a little extra linseed oil with the paint on your palette can help speed the drying time of your painting.
This will make your paintings dry in a day or two compared to a week.
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.