CrownSaver Crown Repair System lets you rebuild and waterproof crowns in one trip. And you get a 10-year warranty against cracks caused by shrinkage to boot. Here we offer the 50' roll of FormFoil (pictured on the right in the photo), an aluminum foil-backed adhesive that is pressed in place over the existing crown. Formfoil acts as a bond break and water-tight flashing system between the old and new crown. Then CrownSaver can be applied over the FormFoil. CrownSaver sold separately