The cold wax medium is actually something that comes in a can and is a waxy paste and can be melted into oil painting mediums to reduce gloss. I just got it into my head one day that I wanted to paste wax a watercolor just to see what it would look like sealed under wax because of course once you wax the surface you cannot out watercolor or any water based paint on it. I liked the soft effect of the wax rubbed into the paper. I have a very long painting called My Soul that is waxed. It doesn't change the colors at all and isn't visible once it is rubbed on. It's made by Gamblin.
It sure would be nice not to have to do the whole mat/glass thing, especially since some shows and galleries are now requiring folks use plexiglass, which is quite expensive.
Spraying on a light coat of it changes nothing and is invisible to the eye.
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