I sprayed this with a 3.0 fluid nozzle, it was very difficult to spray, super heavy (heavier than other spray fillers) I will try again with a 3.5 some time. The product sands clean from the start, no clogging. Sands a little on the hard side. I've sprayed spis/standox poly, this is not the same animal. The only thing it has in common is that it sands clean with no clog from the start. But it sands harder than spis/standox and is more difficult to spray. Spraying with a 3+ mm nozzle may improve results.