Hello! I've used Krylon UV Archival matte spray on some of my watercolor pieces in the past. I believe it also comes in satin and varnish (shiny?). It comes in a spray paint-type can and I've never had any trouble with it smearing or lifting my paint. Here's an Amazon link to the one I've used!
https://www.amazon.com/Krylon-K01377000-Gallery-Archival-Varnish/dp/B003VWMM4G
I like spray on finish with UV protectant. This is the satin finish - a couple of coats will give a nice sheen and protect your work.
Very nice!
I like Krylon artist's spray It's made to protect artwork, and has UV protectant.