What type of sealant is specifically designed for use on horizontal surfaces?

Grade P sealants are specifically formulated for use on horizontal surfaces. These sealants have a specific consistency and adhesion properties that allow them to remain effective and maintain their integrity under conditions typical of horizontal applications, such as floors and driveways. The formulation allows them to resist sagging and ensure a strong bond with the surfaces they are applied to, effectively preventing water infiltration, protecting against moisture, and accommodating movement in the substrate.

In contrast, Grade NS sealants are non-sag, typically used in vertical scenarios where gravity could affect their application and performance. Type S sealants are often used in situations where strength is more critical than flexibility. Class 25 designation refers to the elastomeric qualities of a sealant, indicating a specific level of movement capability, but does not inherently define its suitability for horizontal surfaces like Grade P does.