Abstract: A composition suitable for forming surface coatings, laminates or composite materials formed by bringing together:(a) a first polymer containing carboxylic acid, anhydride or acid chloride groups,(b) an amine or alcohol or a derivative thereof which is a tertiary amine, a ketimine, an acetal or an oxazolidine and(c) a second polymer capable of cross-linking with the first polymer in the presence of the amine or alcohol.The components may be initially in two packs and either mixed prior to application or sprayed onto the surface simultaneously from separate nozzles.The surface coatings are particularly suitable for coating surfaces which are otherwise difficult to coat and protect and may be applied to wet or rusted surfaces without surface preparation.