Originally Posted by 1930u
Just started back to work on the Hot Rod after a long sabbatical. Today I made up a bracket and mounted the proportioning valve. I wanted to put it in a protected spot that was easy to access. Now that I've done the work I don't like the way it looks. Maybe it's the purple anodized coating.
I might change it out, or at least strip off the anodizing before I drill, tap and install the line clamps.
Glass beading will rid it of the anodizing. If that's not practical, a strong base removes the aluminum oxide surface treatment and exposes the untreated aluminum beneath. Lye (sodium hydroxide) will work, as will a cleaner like Driveway Cleaner sold in parts stores, Black Maxx (NAPA), or any of the more concentrated alkaline cleaners like that will work.
If you use lye or strong cleaners of any type, dilute it to the weakest solution that will still do the job. Use eye/hand/body protection and keep a supply of fresh water on hand just in case.