PURPOSE: A preservation method for a brassware is provided to supply the brassware having an excellent water-repellency for waterproofing, and a dense self-structure for preventing the access of corrosion gas. CONSTITUTION: A preservation method for a brassware comprises: a preparing step of preparing a one component preserving agent; a washing step of removing foreign matters such as rust, dust, and water from the surface of the brassware to be preserved; a preserving step of coating the brassware, which is washed and dried, with the preserving agent to a thickness of 5 to 7 micrometers, and drying the brassware. A manufacturing method of the preserving agent is as follows. 290 to 300g of IPDI(isophorone diisocyanate), 85 to 90g of polyetherglycol-400(weight-average molecular weight 400), 70 to 75g of polyetherglycol-1000(weight-average molecular weight 1000), 40 to 45g of 1,3-BG(1,3-butylene glycol) as a cross linking agent are inserted into a reaction container with less than 1kg of toluene as a solvent, and are heated to a temperature of 652 Deg.C at an interval of 5 Deg.C/10 minutes. The temperature is maintained for 8 hours for synthesizing NCO 50.3% of an isocyanate terminated pre-polymer, and then the isocyanate terminated pre-polymer as a solvent is diluted at a concentration of 35% with acetone.
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