Having only worked with my old man, and never really coming in contact with any other plasterer, with us just doing domestics and work for small builders we would never hear about any newer products or tool. The plasterers forum is great for this! My dad is very old school and doesnt trust or really want to learn new methods or products. I don't know how long grits have been out but yesterday was the first job we had used it, thanks to reading a few threads on here. What a difference! Reskimmed a kitchen with very glossy paint, it felt like the plaster troweled better than on any other background i've went over, including boards. seemed to set alot more uniformed than it would going over pva.