Q.- Can you stain over stained stamped concrete?
A.- Yes, so long as the sealer has been completely removed or worn away. You can pour water on to test. If it soaks right in then the stain should also, and if it kinda sits there for a while or beads up, then you may have sealer to remove. You should also do a small test with the stain in an out of the way place to be sure.