Eight urea-formaldehyde (UF) glues and one acid phenolic (PF) glue were compared with established glues of the casein and resorcinol types as to long-term durability, by accelerated and natural aging. The purpose was to evaluate these glues for structural softwood bonding. After unprotected outdoor exposure, only the phenol resorcinols still met the requirements of the Norwegian Glulam-Control (Norsk Treteknisk Instituut, 1975) after 10 years. In the case of indoor and protected outdoor exposures, all glues except acid PF and one UF had sufficient shear strength after 15 years. All the glues seemed to have gone through a period of stress buildup in the gluelines, followed by relaxation (probably due to creep). At the stage of maximum stress, the caseins and resorcinols were still sufficiently strong, but some of the UF and the acid PF were below requirements. Acid PF seemed to damage the wood (spruce). Accelerated aging distinguished between glue types in the same order as natural aging, but was less satisfactory between brands within a type. See also IIC Abstracts 4-3789. -- AATA