RectorSeal® Sealmaster" Boiler Leak Sealer, 1 qt, Composition: Sodium Silicate, Calcium Magnesium Silicate, Liquid, White, Mild, 1.42 Specific Gravity
SEALMASTER" fills and seals cracks, holes and loose joints in steam systems. It forms a cement-like water-tight plug. SEALMASTER's unique corrosion inhibitor protects the boiler's surface from pitting, even after complete draining.