10.1 oz. Acryrub Firestop is a one-part acrylic latex caulk designed for sealing around through penetrations in fire-rated wall and floor assemblies to return those assemblies to their fire-rating. Characteristics: Permanent color, UV resistant, Non-yellowing, Very good adhesion on many materials, Very easy application. Applications: Sealing Through Penetrations through Fire rated wall and floor assemblies. Color: Red. Packaging: 10.1 fl. oz. cartridges. Surfaces: Type: all usual building surfaces State of surface: clean, dry, free of dust and grease. Preparation: No primer required for porous surfaces. We recommend a preliminary compatibility test, especially on PVD and non-porous materials.