Andrew, ever used Aqua Mix Enrich 'N Seal before? I've used a couple of Lithofin products and felt they just weren't really up to much. Would be nice for a comparison.
You wouldn't use a surface sealer then?
To be honest, I've had a couple of bad experiences with impregnators in the past, water marks etc becoming permanent, so I'm very wary about playing with one on such a floor!
When you say "thoroughly dried" does this normally mean cleaning one day and coming back to seal a day or more later? Or would it be possible on the same day with the use of fans to dry the floor? Obviously a dehumidifier is going to be useless in a swimming pool area!