GF-series ITEM-D repair cracked cement - GF-Series Item-B2 polyurethane crack repair ,concrete repair product. GF-Series Item-B2concrete floor repair products GF-Series Item-B2 750ML PU foam, Class B2. The foam dispenses from the aerosol can …Hsc Nr - thea.comThe crack itself is not visible, the neck re-finish is not cosmetically conspicuous, the guitar has been continuously played since this repair, and my luthier certifies it is totally stable. Like all Guild 12-strings, this guy is built like a tank, g