Can a second layer of Sikaflex+ Self Leveling Sealant be applied over a current one?
Sikaflex+ Self Leveling Sealant and all of Sika's polyurethane sealants will bond to themselves. The surface of the sealant must be clean. Please allow the product to cure for 3 to 5 days. It will cure to a flexible and elastic consistency. After, you can wipe the surface with water and a clean rag to remove any debris on the sealant. Once the sealant is dry, reapply the second layer. If the sealant is more than a month old, a solvent wipe with a rag is recommended. Xylene or Acetone can be used, allow the solvent to fully flash off. You do not want to trap any solvent between the layers of sealant.