Durable anti-rusting method

A method of providing durable anti-rusting proofing to a building construction material used in the construction of buildings and wherein said building construction material has an outer surface and capillary walls, comprising mixing an anti-rusting agent selected from at least one member of the group consisting of 2-(4-thiazolyl) benzimidizole, dibenzylbromoacetate, N-(fluorodichloromethylthio) phthalimide, and N,N-dimethyl-N'-phenyl-N'-(fluorodichloromethylthio) sulfamide and a permeable water proofing agent composed of a plurality of water-proof resins constituted principally by non-silicon water-repelling resins in a petroleum based solvent and a paraffin or aromatic based solvent mixture having an infrared absorption spectrum as set forth in FIGS. 1(A) and 1(B), diluting the resulting mixture with an organic solvent containing at least 60 to 70% toluene, coating said outer surface of said building construction material with the diluted mixture of anti-rusting agent and water-proofing agent, permeating said diluted mixture into said building construction material from said outer surface through said capillary walls, and forming a gel layer by chemical reactions of said diluted mixture in and on the surface of the permeated material after evaporating said solvent, thereby resulting in a strong waterproof layer isolating an air phase and providing a durable anti-rusting effect.