"Reinforce gel" by Mack's (or Mack's Professional) refers to a line of builder gels designed to strengthen natural nails and provide a foundation for nail extensions, overlays, or repairs. These liquid or builder gels offer a stable, self-levelling formula that is easy to work with for nail technicians. The product is used to add hardness, durability, and length to nails, and it's cured under a UV/LED lamp. 
Product Features:
Reinforcement and Strength: The primary purpose is to increase the hardness and strengthen weak or thin natural nails. 
Building & Extensions: It's suitable for creating nail extensions or overlays for a flawless finish. 
Repairs: This gel can also be used to repair existing nails. 
UV/LED Curable: The gel needs to be cured with a UV or LED lamp to harden. 
Self-Levelling: The formula is designed to level itself out, making application smoother and faster. 
Professional Quality: Mack's Professional offers this gel for beauty professionals who require speed and precision. 
How to Use:
Prepare: After applying a base coat, the reinforcement gel is applied to the nail. 
Apply & Shape: The gel is used for building, extending, or reinforcing. 
Cure: The applied gel is then cured under a UV lamp for a specific duration (e.g., 2 minutes) or an LED lamp (e.g., 30 seconds), according to product instructions. 
Finish: After curing, color gel and a top coat can be applied to complete the manicure