Rock,
I've been in a similar situation with my steps for a number of years and likewise, not sure what to use for the fix. Mine have a few small cracks but a lot of black spots of something that appears to be poking through to the surface. My dilemma was I didn't want to drain all the way down because of the older liner. Got the idea to dam up the stairs last Fall and found the concept should work but over the Winter my priorities shifted and I never followed up. Check this thread. May give you some ideas.
Al
http://www.poolforum.com/pf2/showthread.php?t=5804
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