The product is really good, but it tends to liquefy too much over time.....still...it remains the best solution. All the others do the same, but this one comes with the double product bottle, so you can apply more of the one you need. The small bottle, silicon based solution, coats the inside of the female in order to fill the holes and scratches, the bog bottle acts like a base to retain small water drops and use them as ball bearings