Remember too,when you re-apply the undercoating It'll take up some room around the seam making it virtually invisible from the bottom.Just don't glob it on too thick or it'll probably fall off in chunks.Another way to prevent future rusting is with Eastwood's chassis black/or rust inhibiter.Keeps a "barrier"between the outside world and undercoating which sometimes has a habit to act like bondo,it traps moisture between itself and the panel it's protecting.
I'm contemplating removing whatever undercoating is left and re-coat it with satin black.I avoid driving in the rain as it is,and snow is out of the question.Plus it looks really slick!:biggrin: