concrete hairline crack filler

Hi,
This is in the welding section, which is probably the wrong place. I am wondering if anyone has had any experience at filling hairline cracks that have appeared on a concrete slab. Mine was only laid in the last 12 months and this heatwave in the last couple of weeks have brought them out. They are less than 2 mm wide, but a bit of an eyesaw.
I was wondering if anyone has used a product that they can recommend, it would be good if there was something that was strong and matched the colour of the portland cement.

Thanks,
Darren

Selleys Quickcrete is the stuff you need
My old 20 x20 garage had cracks hell, west, and bent. Some of them a couple of mil wide and this stuff has been down now over 6 months without any sign of re-cracking - Even painted over some of it

Ian

I've seen epoxy used (2 part), mixed as liquid and poured in, though the cracks were wider than 2mm, I think.
Colour did not match, obviously.
I don't know where to get it either, so I'm probably not much help, but a search might turn up a supplier.
Another alternative might be ardit (sp?), or some such leveling compound. Would give a better colour match. Lanko is another brand.
cheers
TM