When to Frame
You can frame a painting any time. Some artists even put the painting in its frame while they are still working on final touches so they can see how the piece looks in its frame. I usually order the frame as soon as the final size of the painting is agreed on.
As for the final framing, it can be done as soon as the paint is dry to the touch. I say wait until it dries simply because you do not want the wet paint smudged.
But if you want to wait until the final varnish is applied then you would have to wait a few months, even up to six months or more depending on how thick the layers of paint are so that you do not varnish over paint that is still curing.
As a side note, the reason you must wait to apply final varnish is because oil paint shrinks as it cures and the varnish would crack if applied too soon.
So you can put a canvas in a frame at any time even before the final paint dries if you are careful.
Hope that answers your question.
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