What type of Varnish is best to use for an Oil Painting?

I recently finished an oil painting (let it dry for a minimum of 4 months) and I want to apply varnish to it. Which one is the best? I'm not familiar with Matt or Picture Varnish or any of that other stuff. Can someone please tell me the differences? Which ones/ products do you highly reccommend? And can you put more than 1 layer of Varnish? If so, how long do you have to wait before it dries to apply the second coat?What type of Varnish is best to use for an Oil Painting?
I use Winsor %26amp; Newton Conserv-Art Varnish on all my works. It is removable and non yellowing..It gives a soft gloss that is pleasing and not to glossy while bringing out the colors beautifully. Some will suggest Dammar varnish but it is nearly impossible to remove and yellows which changes the look of your painting. When you see the word matte it refers to the gloss or dullness level after it dries.





Giving two coats would be best- waiting as instructed on the label. Probably 4-8 hours.





You can use Re-touch varnish if you think you ever have to re-work a painting later as well. It protects but allows for repainting later.