Hi i came across this forum and i have read a lot of the sealcoating threads...there seems to be confusion about the terminology, when it comes to sealcoating between Canada & the US.... Here in southwestern ontario the most commonly used term is driveway-sealing (as opposed to sealcoating) and the material of choice is oil-based liquid tar (i belive you guys fron down south refer to this as "gilsonite").... There has been lots of talk about adding sand to the mix....i'm not sure about the other materials but with gilsonite you DO NOT ADD SAND under ANY circumstances,as it will quickly destroy your $500 pump, that isnt made to handle sand.... I'm sure the sealcoating you guys talk about in the US (agitation & sand) also exists here, but i'm yet to see someone actually doing it....the customers here have learned that having your driveway professionally sealed, means spraying the shiny stuff.... It needs to be done every year, which is good for buisness....i would compare this to oil-spraying your car.