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29th Oct 2016, 1:19 pm | #21 | |
Guest
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Re: Blackening Stainless Steel
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29th Oct 2016, 1:57 pm | #22 | ||
Nonode
Join Date: Feb 2005
Location: Worcestershire, UK.
Posts: 2,525
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Re: Blackening Stainless Steel
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Steve
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29th Oct 2016, 3:07 pm | #23 |
Dekatron
Join Date: Apr 2009
Location: Oxfordshire, UK.
Posts: 4,923
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Re: Blackening Stainless Steel
Being curious about painting stainless, from what I can find, it doesn't seem to be a chemical compatibility issue, but simply one of stainless (especially rolled sheet) being smooth. This is from the website of Phoenix paints;
"Both Stainless Steel (Chromium Steel, Nickel Chromium Steel) and Galvanised Coated Steels are designed to be a rust free finish to the material and as such they will resist any type of etch primer that is not extremely acidic, and hence hazardous to the user. There is almost nothing that an amateur can do to etch Stainless Steel and our recomendation is to avoid, wherever possible, the use of this material. If Stainless Steel has already been used, the only advise we can offer is the roughing up of the surface with 600-800 grade paper, cleaning the surface with PQ17 and then applying the topcoat directly to the metal. Whilst this is not ideal it is the only way for the amateur" B |
29th Oct 2016, 5:14 pm | #24 |
Octode
Join Date: Jan 2009
Location: Falmouth, Cornwall, UK.
Posts: 1,987
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Re: Blackening Stainless Steel
Having a boat and needing to keep rust stains away, oxalic acid is used on a regular basis for this, however if it gets onto any stainless steel it turns the surface matt. Any subsequent paint that gets on these areas is very difficult to get off as it gets well into the matt area.
Oxalic acid is relatively cheap.
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Stephen _________"It`s only an old telly" ___ |
29th Oct 2016, 11:22 pm | #25 |
Hexode
Join Date: Feb 2006
Location: Diss, Norfolk, UK.
Posts: 386
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Re: Blackening Stainless Steel
My son has a Honda Prelude which is about 18 years old, some of the trim is stainless steel but was sprayed at manufacture with a matt black finish (probably because it was considered to be more "cool") it is only now beginning to peel off.
You might consider talking to some of the motor respray people for some advise. Trevor |