I went with one of those cold-call people back in early '90's. Just to give you an idea of how old that pitch is - my parents told me multiple times to avoid that sales pitch, as they did not when they were starting out and got a coating of used motor oil. I got a decent job (and saw the Henry cans), the guy worked on filling the large cracks before sealing. It was fine for a few years until I had the driveway redone in concrete. The driveway had been shedding a lot of small stones; all that stopped once sealed.