Just after some quick advice. I'm pretty happy with the metal bashing side of things and the fact i'm probably going to crack the paint, but could do with a bit of advice on the prep and sealing before and after. Obviously a good wash first to get rid of the muck, but do I then need to remove the underseal before i knock the lip up or do i leave it in place? Then I'm assuming semi struc. seam sealer to finish it off? A fairly quick, knowledgable answer would be much appreciated