I have an exposed aggregate drive and no matter what sealer I've used, it looks like a million bucks for maybe three months then the sheen fades and it starts looking plain again. Last batch came frm a Concrete Supply store that is a wing of a local concrete company that runs a fleet of cement mixer trucks and nails a lot of the area road work and etc. That [censored] lasted no longer than the stuff from the big box home improvement store, just cost about 25% more...
I don't do it anymore, mainly because I'm riding again and when wet it makes the drive slick and with the grade on the drive I don't want to dump my bike right in my own driveway upon getting home if the ride went wet.