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  #1  
Old 07-25-2016, 02:21 AM
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Default Unpolishing stainless steel

I drilled and tapped a differential lube hole in the C4 batwing that I'm putting on the iron differential in my '69. The pipe plug I'm using is a nice shiny stainless steel piece. I'd like to dull the surface of the plug so it more closely matches the cast aluminum batwing appearance. Any hints on how to take the shine off stainless steel?

Thanks.
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Old 07-25-2016, 09:19 AM
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Seem to recall the welding "paste" goes flat on the finish if you don't buff it after welding (TIG). Maybe check a welder locally?
POR-15 product Metal Ready is used to prep for paint and welding - maybe it does too.

Cheers - Jim
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Old 07-25-2016, 05:15 PM
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Chuck it in a sandblasting cabinet and roughen up the surface?
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Old 07-25-2016, 07:06 PM
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Pickling Paste
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Old 07-26-2016, 02:17 AM
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Yeah--That's what that stuff is called!
That should flatten the finish to match the Al.

jim
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Old 07-26-2016, 04:57 PM
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Okay, I'm a bit confused. Are we talking about brazing type flux, or something different?
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Old 07-26-2016, 06:17 PM
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I think it is an acid paste. It's used on stainless weldments to remove the discoloration. It also etches the metal and leaves a satin finish. I suppose its a more aggressive passivation technique.
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Old 08-04-2016, 11:29 AM
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Sandblasted stainless looks dull grey, pretty much like blasted steel maybe a little lighter grey ....
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