If you ain't using this stuff, you ain't doin it right.

I've used this product several times and it works great. I've also used the Glasso and Standox spray filler and Upol works just as good. I do recommend a small amount of Standox PE thinner to spray easier. I use SATA PE spray filler gun with a 2.0 nozzle set. Blocks great and leaves panels straight.

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.

One of the best poly primers you could buy, I'm a big fan of SPIES poly but this sprays and sands exactly the same