Baggy bear sorry I didn't reply sooner,
I definetly think your clients who want a dark tan (i know the kind of clients as I have them myself lol) will not be satisfied with suntana rapid as it definetly isn't dark.
I washed off after 4 hours & had roughly an 8% or there abouts then it gradually deepened to I'd say about a 12% which took until the next day to get to max colour, but it definetly did not darken any more than a 12%
It's a really nice tan (colour) don't get me wrong, & well worthy of stocking if you don't have the majority of your clients wanting dark. But for my clients I don't think it'd be a hit, so I've decided NOT to stock it.
I do stock the ordinary suntana though & my rapid tan is still vani-t velocity but for me the vani-t rapid will take some beating. xx
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