OSI SBR100 Window and Siding Caulk is a single component, medium grade, solvent release caulking compound. Formulated for year round use, it will extrude consistently and easily from 0 °F to 100 °F. This product air cures to form a tough elastomeric seal that maintains its bond under most weather conditions. OSI SBR100 was developed primarily for the aluminum siding industry to eliminate the problems of extrusion, cut-off, stringing and dirt collection commonly found in oil-based and butyl caulking compounds. OSI SBR100 requires virtually no tooling when applied as directed.