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					Originally Posted by  David R
					 
				 
				You just paint or splash it on. It's no odder than instant coffee. It's a slow etch and needs renewing as it loses strength, but it does give results, is easily available and does not need special precautions. Rinse off when/if you get the result you want and oil the blade. 
			
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 What kind of timeline are you talking about for the application? May give it a try.