CyanoacrylateCA

An adhesive designed to carry significant service loads as part of an engineered joint, transferring stress between substrates over the whole bonded area rather than at discrete fasteners. Epoxies, polyurethanes and methacrylates are the main chemistries, used in applications from aircraft assemblies to wind turbine blade bonding.

A preparatory coating applied to a substrate before an adhesive, sealant, coating or waterproofing membrane, improving adhesion by sealing porosity, binding dust or providing a chemically compatible surface. Primer selection depends on both the substrate and the product to be applied over it.

The period after an adhesive has been applied during which the parts can still be joined and a sound bond achieved. Once the open time is exceeded, through skinning, solvent loss or advancing cure, the surfaces no longer wet each other properly and the joint will be weak.