I use it quite a bit with my clients and we all love it......
I have a little timer on my desk, wait for 1 minute after finishing varnishing, spray, then set my timer for 4 minutes. Whilst they're drying I fill in their record card and discuss any retail sales I suggest or recommendations and by the time we've finished the 4 minutes are up and they're done
I always get them to check they are not still sticky by
gently touching their thumbnails together, if they stick, then we chat some more, if they glide smoothly then they're done and off they go
And, as part of the Solar range, it smells yummy :o