I used the rough on the exterior, but had the need for some smooth stuff too, which I rolled onto the interior of a metal storage container. I was concerned that the smooth would not look even or would be runny during application. It was a bit thinner than the rough version, and didn't apply as easily as the textured stuff (a little more runny), but it dried without brush or roller marks and wound up looking pretty good. It feels a bit more rubbery and softer than the textured stuff for some reason. Probably because you can actually run your hand over the smooth stuff without ripping it to shreds /forums/images/graemlins/yikes.gif /forums/images/graemlins/histerical.gif
If I ever have to recoat my exterior, I'll probably just roll on some smooth stuff.