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We find this product to be an excellent bonding agent for bonding our panels together. The putty color matches original used in 1953-1972. It can also be used for bonding any GM panels made from original style glass used from 1953-1972. It can also be used as a heavy fill when needed rather than using body fillers. This product has a heavy concentration of fiberglass and usually requires a grinder to level it, because it is very hard to sand. We DO NOT recommend this product for bonding stock 1973-1982 GM panels because of high filler and low fiberglass content in these panels.