Well I went with an auto-store shelf brand spray under coating and after spraying and letting it set for about a week I could rub the stuff off with my finger (pretty disappointing).
So I pulled that stuff off, and bought a better quality paintable undercoating from UHC, it was about twice the price of the cheap stuff. The paintable undercoating went on much nicer and within a couple of hours was touch-dry and solid as a rock. Ya get what ya pay for!
Bruce
