I had a pole barn built 15 years ago. It is metal siding and metal roof. The builder used nails with rubber gasket instead of screwson tghe roof. The rubber is now going bad and the roof is leaking bad. If there were screws I would just replace them. Because they are nails I can't remove them and any way I try to remove them damages the roof and also looks horrible with dents. I tried nail pullers of all kinds and hammers both with roof protection under them, but nothing works. I also tried caulk on each nail, but that releaks after a year or two and also looks terrible. I just want to pull the nails without damaging the roof and put in new screws. It seems like I just finished paying for this barn and I don't want to tear off the old roof and replace it correctly. HELP!!!!