If a client complains of burning after a pink-and-white fill, what is the most likely reason?

The most likely reason for a client experiencing burning after a pink-and-white fill is the application of too much methacrylate primer. Methacrylate primer is used to enhance adhesion between the natural nail and the artificial nail product. However, when used excessively, it can lead to a strong chemical reaction upon application, leading to a burning sensation.

Understanding the properties of methacrylate and its role in the nail enhancement process is crucial for preventing this burning feeling. It is important to apply primers sparingly and as per the manufacturer's instructions to avoid causing discomfort to the client.

While incorrect filing technique and inadequate curing time may contribute to various issues within the nail service, they are less likely to cause a burning sensation directly related to the use of primers. The use of outdated products could potentially lead to overall performance issues or reactions, but in this scenario, the specific symptoms pointed towards an inappropriate application of the primer.