surface finish

mercredi 5 août 2015

Hi all
I have had reason to make a fuel dipstick, the stick looks o.k. and does what a fuel stick should do, however I can't see the fuel level on the stick.
The stick is made of aluminum with a brass insert, the reason for the insert is, after the first attempt to get a reading failed, I dipped a piece of brass in the fuel, I could see the level, so I added the brass strip.
Job done, nice and clean, too clean, can't see the fuel, I have removed the patina, so the question is how to get a finish on the brass that will} not contaminate the fuel and will stay put. I am unable to see the fuel on the aluminum whether it is polished or left dull. Has anybody had a similar problem?
Regards
Ted


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