I've been polishing my nails nearly every week lately, and my nails were showing the effects! My nails felt dry and ridged when they had nothing on them, so I bought this strengthener to use under polish or when I don't feel like doing a colored manicure. It dries very quickly and leaves a nice shine.I applied a new coat of this everyday for a week, without adding any other polish on top. After removing it at the end of the week, my nails feel stronger and the ridges are almost gone. I'll buy this again!