What it is: A 5-in-1 formula that works like a primer and base coat under gel nail polish.Who it's for: It works especially well for regular gel-polish users with thin and brittle nails.What it does: This formula works as a protective base coat to shield and smooth the nail surface before your gel polish application. It can be used for nail extensions, nail repair and applying nail gems. The color is semitransparent with a hint of pink. It must be used with an LED lamp. How to use: Application is the same as Le Mini Macaron 1-step gel polish. Cure for 30 seconds under the Mini Macaron LED lamp (or 60 seconds under the Maxi Macaron LED lamp). Note: The polish will be sticky after it's cured. Apply two coats. To wear alone, wipe with Le Mini Macaron nail cleanser to remove stickiness, and you're done. To wear as a base coat with gel polish, do not wipe after curing. Directly apply Le Mini Macaron 1-step color over the builder gel. Cure color as usual, applying two coats, and you're done. 0.29 oz.