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Good morning Steam Guy WillyOn aluminum and brass I use a product called Alumabrite it will clean all oil, surface oxide and etc. I then wash the parts real good with clean water and then dry off with paper towels. Apply the first coat of primer as soon as the parts are completely dry. This is a acid compound so you have to be careful using it. I do use the acid etch pre painting paint from Phoenix Precision Paints, am was just enquiring about a solvent to enable the JD weld to adhere to the brass and Nickel silver components.....Thanks for your info. .a few pics