Builder gel is a flexible gel coating used for natural nail overlays, but it's also great for small extensions and repairs. It sits between gel polish and hard gel on the strength-flexibility spectrum, offering a balance of both. Builder gel provides a flexible covering that moves with the natural nail while still offering strength for those who need it, and lasts for about 3 to 5 weeks. Edge your way to stronger nails. Discover the power of The Edge Brush On Builder Gels. Save when you mix & match any 3 builder gels for £24.