This shows the underneath of the floor, which had approximately 8 hours of sealer removable followed by a buffing with an angle grinder-mounted wire brush. The main seams were then welded as shown. It was deemed necessary by Mick to remove all the underseal as it causes spit backs and also looks very unsightly when it blisters off. In addition the action of the welder and the fierce heat produced tends to create salts, which trap moisture and cause rust underneath the underseal.