hi rvagnoni,
email me, i can definitely help you. everyone here where i live has agg. driveways, seal a hundred or so a year. i have never heard of the products dan mentioned, but we have lots to choose from here that are made especially for aggregate only. high resin contents, get brown or grey tints, looks shiny and wet, keeps rocks from coming loose, if you have a lot of these in your area, you'll definitely want to get into sealing them, easiest money you'll ever make and it will blow the customers mind by how good it looks. email me or call me, definitely can help.
jon fife
nashville,TN
(615)837-3663