Nice river technique and finish with Minwax Polyurethane Varnish

I have seen a fair few attempts at rivers in the past. Some really good ones. Some dire ones. But I spotted this video via a link on TMP and though it worth a share.

The basic fabrication is pretty simplistic. The tip with the sand is very effective and one I will copy my self I think. The other was the water effect. The painting tips are pretty understandable.

But the glossy finish is achieved using Minwax interior Polyurethane Varnish.
He has applied a couple of coats. And the effect is great. Not tacky and not too shiny.
One tip to definitely note for future.