Carboguard 1340 FC is a primer/sealer recommended for bare masonry and other substrates requiring sealing prior to coating application. This high solids, low VOC product has excellent penetration and sealing properties on many substrates. Carboguard 1340 FC cures fast in cold weather and is recommended as an alternative to Carboguard 1340 in such conditions. Use standard 1340 above 70°F.