Patent ID: 7189429

Claim:
A method of forming a coating on the internal surface of a pipeline, the method comprising the steps of: a) providing a liquid, two-part coating system; b) mixing together the first part and the second part to form a mixture; and c) applying the mixture as a coating to said surface so as to form, at high cure rate, a monolithic lining which exhibits high strength and flexibility; wherein the first liquid part comprises a polyisocyanate prepolymer derived from an uretdione, a biuret or an isocyanurate of hexamethylene di-isocyanate (HDI) blended with a member of the group consisting of the uretdione of HDI, the biuret of HDI and the isocyanurate of HDI; and wherein the second part of the liquid coating system comprises one or more aromatic polyamines.