The last thing I do before framing a painting is to apply two coats of clear acrylic varnish.For this part of the process I move out of my "residential" studio (a converted spare bedroom in our house) to the more industrial space of the garage.
The clear coat gives the art a nice shiny appearance, and also provides protection from fading and damage, so they can be framed without glass.
When dry, you could probably serve a cheese course on the paintings and wash them off without any harm, although my feelings might get hurt.
The coat of varnish also gives me a psychological endpoint -- it forces me to consider a painting to be finished, and to stop tweaking, repainting, and fussing over it.
I snapped these with my phone; please excuse the shakiness.