K 1 1 Waterproof coating is one of the most widely used products in home decoration waterproofing, which is generally used for waterproofing bathrooms, kitchens and balconies. Relatively speaking, the ventilation performance of bathrooms and kitchens is not very good. Therefore, for the health and safety of family members, we must choose products that have passed the China Environmental Label Product Certification (commonly known as ten ring Certification). Don't buy the most expensive, only the healthiest.