Subo,
It depends what relationship you have to each customer. If they have known you a while, they will accept your advice. New customers, especially from NSS, will probably not. So give them time
We converted all our acrylic customers in our salon. We simply told them it is a new type of material that is a gel-acrylic hybrid and wears as long as acrylic. But it is healthier for them and us, because it doesn't have chemical vapours. We also offered to remove free and provide acrylic again if they were not happy. After 4 weeks, none wanted to go back to acrylic. They love POLYTEK! These were all clients that are really hard on their nails.
If you need help to explain stuff like this, you can always contain me in our group or drop me a PM. Always happy to help xx