Leaking shop/garage roofs.

[Mr. T]

Need some help guys. Both my pole garage and pole shop roofs are now leaking, almost every time it rains or snows, and then melts. This past summer I climbed up on the roofs, and pounded each and every nail down, and then usued a special sealant around each nail head. Thought I had it all fixed up and rain resistant, until a couple of days ago. You will never guess which cars I store in my shop and garage.

Anyway, I called up a couple well-known companies that use a spray-on material that works very well, with a high success rate. However, it only lasts 5 years. It's either going with the spray, or put on new roofs. Luckily, I have been able to keep all of my cars dry.

Any suggestions what spray I could use, or what nationwide company I could call? Anybody else with this experience? Looking for an immediate fix. Thanks!