I'm considering buying a new aluminum boat. The one I'm looking at has a couple areas in the sides of the hull that have small dimpled areas (about 2"x2") that are not perfectly smooth - feel a little bit bumpy. It appears that these may be areas where the cross beams were welded to the hull. My question is are these normal or should I be concerned about them? This is a new 22'with a welded aluminum hull.