I have used this in my FJ40 restomod. It is a great product, very hard once cured. There gun works great, a regulator is a must! The gun cranks out a lot of cfm too so a home depot 2-3 cfm compressor isn’t enough. I found you don’t have than much time once you mix and start because it is catalized. I wouldn’t want to wait for my compressor to recharge cause it starts to get thick on you. I used 1 kit on the bottom/firewall of my project which is actually a 43 length body after the project, which in hind site is a little thin. If you get it on thin it isn’t sealed and water can get in to start rust if you are going over bare or primed steel. Painted will be fine. I used 2.5 kits to do the whole inside of my Fj40/43, floor/back sides ceiling. Again, in hindsight I put it on too thin, because it is not as sealed as I would have liked.
Bottom line it is a good product, put it on 20% heavier than the box suggests. The colour will be a touch lighter if you are going for an exact colour match, or at least it did on the red and grey in my project. It is VERY smelly so you need to do it outside or in mechanically vented area and I strongly recommend an organic vapour filter half mask respirator. I cleaned it up easily with ‘gun wash’ which is really strong paint thinner auto body guys use. By the time I had sprayed 3.5 kits I was comfortable with getting a consistent finish. Low pressure is you friend.
More details can be found somewhere in my build thread on IH8MUD:
Here