Factory pinch welded every 4 inches I tack welded every inch on both sides...
This truck had zero undercoating and light paint at best from the factory and a light paint job on the top side of the floorboard.. I'm going to use that encapsular / primer on both sides then seam sealer on both sides and then epoxy paint both sides... And on the top side I'll put dynomat from the dashboard all the way up the back wall to the back window... Then carpet...
Not only will it be never seen again you should be able to lunch rockets off of it...