Crystal Nails Builder Base Gel 15ml £19.95 Quantity: at £19.95 each Add To Basket 1 in stock. New! Builder Base Gel - the strongest adhesion CN base gel New development inconceivable adhesion: feel confident that any adhesion problems of your clients nails have been resolved when they leave the salon. Thicker base gel. Due to the shorter brush, the base gel is easier to apply thinner, smoother and more precisely. Apply a thinner layer if being used under Crystalac; note even with a thin layer, the soak off time will be longer because of the stronger adhesion.