Originally Posted by DailyDrive

There's theory, and there's reality. The theory part is on the back of the can, yes. But the reality is any sealer will eventually chip. Usually in places where there was the most rust before. Once water gets in behind the pretty sealer, it will continue rusting either until your metal part is rusted through, or until the pretty sealer falls off in big chunks and you finally notice the horrible rusting below.