How to protect art on canvas for the garden display?

I have several pieces of artwork on canvas, nothing too precious, sentimental or costly, but nice vivid colors that I want to cover-protect with something (a glaze? clear varnish coat?) to be able to hang in shady spots in my garden sitting areas. What should I use - and how to apply so that I may leave it out in the weather? Just so it's good for awhile, don't expect it last forever - but better than sitting around, not enough indoor wall space! Don't mind if I have to take it to the porch in the winter......

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