Typically this system is installed over a structural metal roof system where the existing roof system becomes the metal deck for the new roof system.
Roof repair gap in tin.
I am not a professional roofer but.
Smaller nail holes will be permanently fixed by this method standard roofing nails would be either 3 8 inch or 1 2 inch making a hole.
Repairing a metal roof seam with turbo poly seal is simple and it is a do it yourself p.
How it works the metal retrofit system is installed by filling in the area of the metal panel between the metal ribs with an insulation board.
Cover the base coat with a piece of glass membrane fabric.
Apply uniform layer of metal roofing base coat 6 inches each way of the gap at the overlap with a paintbrush.
Cut the fabric to size with.