How to test gel polish curing time before a full set

Gel curing problems are easy to blame on the brand, but a lot of them come from not testing the polish with the actual lamp on the table. I learned this after a dark color looked perfect on top and still stayed soft underneath. The set looked clean when the client left, then the edges wrinkled and lifted within a few days. Now I test new gel colors before using them on a full set, especially blac…