I bought 6 different sealers and tried on wxtra paveds we had lating around. This was by far the suoerior of products. I had a guy here doing venetian plaster and I asked if he could use this sealed to seal outsode becaue it was UV resistant.  He must have liked it becuse he came in and sealed all my inside venetian plaster as welll and then asked wherenhe could buy it because he liked this product so much more than the stuff he uses from Italy