Dave, I airbrush General’s high performance clear on all my carvimgs over acrylics. It is available in gloss. Semi-gloss, satin and matte. It seems to bring out the color as well as protect. Available at Woodcraft. I have tried minwax clear in spray cans but my experience was that it didn’t spray well. A lot of people use krylon which I hane found to spray well from cans if you don’t want to airbrush.
Roger