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Hi Linda,
I do not know of any negative aspects reagrding oiling out, except for inablility of paint to adhere if too much oil is used. The way I learned to do it is to drip a few drops all over the canvas, leaving roughly a fingers width between each drop. Then taking a soft rag you spread the oil all over the dry canvas making sure you covered all areas. Tilting the canvas helps to see missed spots.
Now this is the important part:
Making sure that your fingers are clean and oil free, you rub a finger tip gently on the canvas and look at it. If it looks like you just bathed in baby oil, then you have used too much oil and need to wipe it off with a dry/clean/unsaturated part of your cloth. The ideal is to have a very slight sheen on your finger. This way the the dark,sunken in areas come back to life and the new paint adheres just fine.
Hope that helps!
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