I have been spraying them all for years (Aerothane, Randthane, and Superflite). They all have different characteristics but all spay well with the right equipment and correct thinning. I think the key to doing any of them well is correct thinning for the temperature and the spray equipment. Randthane and Superflite are easier to spray in that they contain higher solids quantities,but it is still about thinning and that is trial and error until you get what works for you. I do mostly aerothane because of STC requirement and will say that it is more difficult to do consistently until you learn how to spray it,but I like the end result and so do the people I have done it for. With aerothane you have to wait a bit between coats to allow it to tack. I wait as much as an hour sometimes depending on how it acts. Don't hurry it and you will get the best results. It can be sprayed up,down, and sideways with no problem if you get it right. I'm proud of the fact that some of the improvements in the latest poly fiber manual are from my experience and input,including waiting time and thinner requirements. Practice and good luck, Reid