Painting a sloping concrete driveway ??

Hi All,
I want to paint a concrete driveway and would like to know if anyone has any experiences they can share. I extended the driveway (on the sides) last year and now want to paint it so it all blends in. The driveway slopes about 20 degrees and has a couple of minor cracks (3mm) in the old section. What type of sealant can I use to fill in the cracks and what type of paint is best given the slope and high traffic it will take. I have already looked at stencilling but the cost is prohibitive ($3000 for 45sqm).
Thanks