CND retention+ is great! I have a few clients I use this on. However, my favourite system is Young nails, their nail primer is called Protein bond, it's non acid and super strong! Plus it barely has a smell no issues here!
You will be amazed at how little you have to do with CND Retnetion+ and how lovely the product is to finish and file. Nothing else quite like it. Plus any extra products I don't need to buy or use, the better. I like my life as a nail tech to be as easy and uncomplicated as possible and that is what CND aim to do.
CND Retention+ is the bomb! I'm with Geeg, haven't used primer in years and years. It's so comforting to know you are using the system with the best adhesion to the natural nail of any system on the market, and with gentle 240 grit shine removal.
It amazes me that systems requiring 100 grit nail plate etching AND a primer even still exist on the market.