Hello, I'm new here. I have a 1973 Porsche 914. I recently had some rust issues dealt with and also a complete bare metal repaint in original colour. However while reinstalling the rear tail lights I found a "hole" in the trunk. It is along the edge of the car were a vertical surface meets the trunk floor. Right above the exhaust. It is approx 5" x 1/2" in dimension. It was buried in this thick tar-like stuff,and undercoating from the bottom. Finally the question. Can "Lab Metal" product fix this? or should it be cut out and welded?Any info appreciated. Thanks in advance. Cheers,Dion