What gun sealant for concrete driveways cracks?

Hi,

I need a temporary fix - a couple of years maybe - for cracks on my concrete driveway. I've seen that you can buy sealants (to use with a sealant gun) to fill them in, but I can't find any from a British retailer labelled specifically for this job.

Does anyone know what exterior sealant would do the job? I can't afford to have the driveway relaid and am going to fill in the potholes with Lafarge High Strength 40N, but sealant would be perfect for the cracks.

Any help would be appreciated.