I stripped all the POR-15 off the floorpans last weekend. The stuff just doesn't hold up like you would expect it to. I have decided I will never use a single part paint on a car again. Also, I will never fall for the "you can paint right over the rust" snake oil pitch again. If you have rust on a car, you have to remove it!!!!!!!!! Just like weight loss, there is no magic bullet, no magic pill, no magic potion to point and click the rust away. It takes hard work, elbow grease and abrasives to remove unwanted corrosion.
I chose to use U-Pol Raptor liner on the pans since it has a hard surface with some texture to it. I was much happier with the texture on the pans vs the texture I got in the wheel wells. I was able to hold the gun back a bit further and I got very even coverage. I used a bit more hardner than directed so the material came out of the gun with a much smoother texture. It took 1 liter per coat to do the pans. I bought a 4 liter kit, so I still have 1/2 of the material left. I may spray the inner quarter panels and the rear luggage areas, I'm not sure yet.