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topic 56181

Lacquering or clearcoating of Anodising


A discussion started in 2010 but continuing through 2020

November 19, 2010

Q. Hi
I am looking for help/products to seal Black/Hard Black anodising with a lacquer. I have a customer who wants to remove machine marks by way of vapour blasting and then have a glossy finish after having them anodised. Any information on processes or products would be greatly appreciated.

Dave Burbidge
Plating Shop Manager - Banbury, Oxfordshire, England


November 22, 2010

A. Hi, Dave.

You should be able to apply nearly any clearcoat to hard anodized aluminum. However, it would seem that you lose most of the benefits of the hard anodizing process if you do so.

Why not polish, electropolish, and/or chemically bright dip the aluminum, then do conventional anodizing, black dye, and seal. You would need to balance the anodizing thickness between too thin for good saturation of black dye, and too thick for the desired glossiness.

Regards,

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
finishing.com - Pine Beach, New Jersey
Striving to live Aloha


November 23, 2010

Q. Hi Ted
I have pointed out to our customer as you say the point of having their parts anodised hard seems to be lost if a lacquer coat is applied after, however the parts in question are married against plastic parts and they want the anodised parts to look more like the plastic parts! They have seen similar camera parts from Germany and want me to replicate them if possible. I however know very little about Clearcoat lacquers for this purpose. Is it possible to dip/spray the finished anodised parts and then stove them?

Dave Burbidge [returning]
- Banbury, Oxon, United Kingdom


March 2015

A. Hi Dave. The dipping/spraying is no problem but the "stoving" might be. It may crack the anodized layer, which has a much lower coefficient of expansion than aluminum. But whether this will cause an appearance problem under the lacquer I don't know.

Regards,

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
finishing.com - Pine Beach, New Jersey
Striving to live Aloha



Product to seal^clearcoat hard anodizing?

April 4, 2020

affil. link
Klasse Glaze

Q. Hello Finishing.com, does anyone have experience with a particular product (i.e. Klasse sealant glaze, ceramic glazings, etc.) that a hard anodized surface could benefit from?

Mainly looking to prevent color fade, shed water, extra protection from elements, etc., as these are brake calipers that are factory hard anodized. I know the HA surface is very durable but it's still not completely impervious to wear and tear.

Jason Peskin
Hobbyist - Half Moon Bay, California USA


April 2020

A. Hi Jason. We changed your wording from "seal" to "clearcoat" because the word "seal" has a universally used & accepted meaning to anodizers and we don't want to muddy the water :-)

A lacquer or clearcoat is not going to perform like hard anodizing, but if you are speaking of the visible non-wear surfaces, yes, you can apply a clear coat of your choice if you wish. We can't suggest specific brands or sources (why?), but readers are certainly welcome to comment on recommended types. Good luck.

Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
finishing.com - Pine Beach, New Jersey
Aloha -- an idea worth spreading


May 27, 2020

Q. Hi there.

I have some hard anodised alloy bicycle components, which were damaged by abrasion from the road surface in a fall. I have sanded out the damage with fine grit water paper, but this has of course compromised the anodizing on that section. Is it possible to cover the now un-anodised section with clear lacquer to protect from corrosion and possibly get a somewhat closer match with the anodised finish.

Regards
Al

Al Schorn
- Auckland, New Zealand

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