The very strong and highly adhesive tape 3M 399 is primarily designed for porous surfaces such as concrete, stone, masonry, and wood. It is weather-resistant in both heat and winter, and it is waterproof. It also resists tearing and unwinds well. It is an alternative to the no longer available 3M 3997 tape. Examples of applications: masking concrete during the application of coatings, joining and masking films, floor coverings, carpets, etc.