Sally HansenMiracle Nail Thickener™, Nail Strengthener, Includes Calcium and Ceramic Gel Formula

Wold this also make your nails grow

Is this better than sally hansen gel rehab strengthener?

Why does it say to use it "up to 4 days"? Can you keep applying coats after the four days? Why do you have to remove and start over after four days?

How many minutes do u have to leave it on?