If you don’t want to hide your watercolour under glass and a matte, you red to find a way to protect the surface. I like to use this on my Watercolour canvases.
While you can use a spray or brush varnish, an interesting alternative is Dorland’s wax. It comes in two sizes (4 or 16 oz) and contains beeswax, damar resin and mineral spirits. It smells nice and not over powering, but ventilation is important. You can use other picture waxes, but they are far smellier.
The process is simple. Rub it in. Let it dry. Buff it up. Repeat if you want. I’ve done a little film, which I hope you enjoy: