Some exclusive products give allergic reactions also even if used correctly. How they are applied and by whom is totally different area i won't get into here. I may hurt some by saying i think it's snobbery to tell a nail tech to only use exclusive products and believe they should use whatever product they like if it's genuine and safe, even if it's available to the public.
Edit to say - the exclusive products come at a higher price all in and that i feel holds back many nail professionals that just can't afford them whether starting out or experienced without the funds available. I would always advise them to first check the legitimacy of a product they can afford and want to use on clients.
Exclusive products is not a useful term, because it implies that a product is expensive and restricted in order to make it exclusive. It also confuses the issue, making it look like using these products is an act of snobbery rather than safety. I use the term professional products because it says what it means - products intended to be used by professionals (although many are/wind up available to the general public). Professional products come at all price points, in fact, many are
less expensive than many DIY, knock offs, and counterfeits. If you can't afford CND, then there's IBD, Tru-Gel and a multitude of other excellent professional brands. And, btw, remember that product cost is a very small percentage of your costs, usually less than 13%. It is often penny-wise and pound foolish to go with a cheaper brand.
The other thing to remember is that clients notice brands. When I was working upgrading NSS and borderline salons, the
first thing we did was get rid of dodgy products - unlabelled, poorly packaged, etc. I was surprised how much clients noticed, but it made a difference. When you use products that your clients can get easily themselves, they begin to think they can do the job themselves. It's not fair or completely accurate, but how would you respond to your hairdresser using a box color? Clients know that part of being a professional is having access to professional products, and question your credentials if you don't seem to have that access. We are selling our expertise, our product knowledge, and our products. We are selling more than a product, we are selling an experience, but products are part of it. I'm not saying you are restricted to using "professional" brands, but one should carefully consider the impact that it has, especially in your core products.