RUST PREVENTIVE SEALANT FOR JOINTS BETWEEN SHEET STEEL PANELS

A sealant comprises, by weight, 100 parts of a base resin component which is a nearly 1:1 mixture of bisphenol A type epoxy resin and a bisphenol F type epoxy resin, 40-80 parts of an auxiliary resin component which is at least one kind of dimer acid modified epoxy resin, 25-40 parts of a reactive synthetic rubber, 60-150 parts of flake filler 16, e.g. flaky silica powder, and 60-130 parts of rust preventive pigment 14, e.g. a mixture of zinc oxide and zinc phosphate. This rust preventive sealant is fairly high in the strength of adhesion to oiled steel surfaces, and rupture of a seal structure using this sealant by the action of excessive shearing or peeling force is always in the manner of cohesive rupture within the sealant layer, so that the sealant remains adhered to the panel surfaces even after rupture of the seal structure.