I have used Sculpey Glaze for Christmas tree ornaments. Most of the reviews I have read are not favorable for the Sculpey Glaze. I can not say that I have had a problem with it for what I use it for. I am not sure how it would do with something that is touched often.
Thanks for your input mst01. I've decided to test both on a couple of pieces (the ones that didn't turn out as planned haha) and I agree with you. While the Sculpey Glaze didn't smear the colors, I much prefer Varathane. Since Sculpey is thicker than Varathane I kept thinking that it was going to smear the colors. Thankfully it didn't.
I just loooove General Finishes High Performance water-based polyurethane, available at Woodcraft stores, at least in Ohio. It's expensive but is perfectly self-leveling. Brush strokes just melt away. If you can find it, it's well worth the price - Beth Curran