Only really seal 1-2 block paved drives a year and only if the customer really wants it done as it can be more hassle than it is worth!!! We use a petrol blower to get rid of the surface sand!!! We are Resiblock trained done 1 Resiblock this year (with roller) and 1 Pavegard (with sprayer) and must admit Pavegard was easier & cheaper (as is water based with no strong smell)
Good Luck
Regards Alan