I used to use OPI in the salon but converted completely over the Vinylux as soon as i tried it
There is no denying that Vinylux Top coats go thick quite quickly, It a super fast drying top coat which means when you paint it on the nail the solvents evaporate rapidly causing it to dry really quickly, but obviously when the bottle is open the solvent are evaporating quickly causing the polish to go thick!
I like to think of it this way, with OPI i had clients drying for 15 -20 mins until nails felt pretty dry but were not completely dry and out of every 4 or 5 manicures i did, I could expect 2 to come back with a smudge (damn car keys and seat belts). With Vinylux I'm kicking them out the door after only 10 mins (i know its 8.5 but i like to give the extra min and half just to be safe haha) , so thats an average saving of at least 10 mins per client (not including redos) and best of all i've never had someone come back with a smudge after using vinylux !
If you work out that you probably get 20 polishes out of a top coat before you have to chuck it, that a saving of 200 mins of your time (and sanity for not repairing smudges! lol) , my wages for over 3 hours is far more than the cost of a top coat so i really don't mind replacing them regularly.
Also clients will love the longevity of the polish, it really is the longest lasting polish i have ever tried, i have one client who gets 2 weeks out of it and only comes back because of regrowth! :O
It will obviously depend on your area, but i find most clients in my area want matching hands and toes and love that they can choose a regular polish on their toes or hands and have a matching shellac application
Vinylux is also my number one selling retail item - even more than solar oil and i never though i'd see something overtake solar oil LOL , once clients try one colour they want more, some of my clients have 11 or 12 colours now