Sharon, I use wax sometimes to have a thicker paint. I am experiment with having a range of differently applied paint in the same picture, and adding wax medium is simple and can be used only in some areas without problems.
I also used it to scumble and I like the effect very much.
I generally don't varnish my painting so I can't really say much on using it as a varnish but David's post is very clear. One of my tutor said that he thinks it might attract dust in the top layer.
Ilaria
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