I used to use a well known brand of natural nail care and they advised that the strengthening basecoats be painted on each day then removed after 7 days and started again. I had a client in yesterday who mentioned the same thing. A thread today about another strengthening product got me thinking - doesn't happen often I'll grant you LOL. The product I use now works with the keratin in your nails and needs therefore to be applied to bare nails - no need to apply a second coat as it will not do anything. Do all strengtheners work this way and being the cynic that I am, do companies advise the multiple coats in order for you to use more and hence buy more. Or are all strengtheners different. I know they have different ingredients before I get lists of ingredients, but fundamentally do they all work the same way.