Hello With all my respect, you can mix brands as when you use a differentrent brand Base coat from the colour or or builder gels, it has nothing to do as I do it all the time. More than that, I use a lot of CND Brisa light Base coat ond other products of the same range and have encountered...
I always suggest to be patient. Nobody is perfect. They are still very small and so good that they can not cope. They will improve. We must order welk in advance which is what I do, I order well befre something is . finished.
Itis not the brand of the lamp what matters. It is its wattage. 48 is the most powerful. If only one client has come back, something is odd with her. I do wipe also underneath. I would do on this client, fast underneath cure of 15 seconds.