101 oz Acryrub Firestop is a onepart acrylic latex caulk designed for sealing around through penetrations in firerated wall and floor assemblies to return those assemblies to their firerating Characteristics Permanent color, UV resistant, Nonyellowing, Very good adhesion on many materials, Very easy application Applications Sealing Through Penetrations through Fire rated wall and floor assemblies Color Red Packaging 101 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 nonporous materials