Concrete slabs and block paving - painting
Inside, the painting would work &amp; should last 10-years before needing to be scraped of bubbles, peels &amp; cracks before a repainting. But, down the long road it'll need to be completely stripped off &amp; re-done, which is a huge pain. But outdoors, no, I haven't seen a paint or paint re-surfacer last very long at all &amp; they fail miserably.

You'd probably be much better off with something like this that actually soaks into the surface to become part of the surface. Scroll down to just above Reviews &amp; to the right side in order to check out the numerous real world pictures.

The garage floor &amp; its driveway apron I did at my old place came out like veiny leather &amp; looked amazing. The real benefit is you just keep re-applying clear sealer, every 5 or more years for me (I only did an early 2nd time for re-sale), so there's no color matching &amp; the stain beneath doesn't lighten nor deteriorate.