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topic 35928

Water Stains on Aluminum Sections

A discussion started in 1999 but continuing through 2019


Q. Does anyone know of a wipe-on product called SharkSkin that is claimed to protect aluminum from discoloration due to oxidation and water staining?

Gary Nitowski
- Alcoa Center, Pennsylvania


Have not heard of SharkSkin, however Everbrite Protective Coating may be what you are looking for. It is an easy to apply, one part, self leveling clear coat which can be wiped on or sprayed on. It will refinish faded metal and protect it from oxidation, corrosion, moisture, salt air, acid rain and other damaging elements. Please feel free to contact Everbrite, Inc., Reno, NV if you have questions. Thank you,

Teresa Sedmak
Everbrite Coatings
supporting advertiser
Reno, Nevada
Everbrite logo

A. Hi, Gary. Theresa has offered you a great alternative, but maybe a little typo slipped in and you were talking about Sharkhide [paid link to product info at Amazon].


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


Q. Staining and water spots on 6061 aluminum. We are a job shop and make a round disk out of 6061 alum. Machining process is cut using kerosene to cool tools. Secondary operations uses a water based cutting fluid. We then wash parts in a industrial water based heated cleaner -- Safety Kleen -- which has a baking soda solution, and air gun them dry. We then wash in tap water in a ultrasonic tank heated to 150 degrees, blow dry again. We are getting water spots and or a white residue on the parts, how can I prevent these or remove these spots.


A. Hello, Jerry. There are many possible causes of white spots on aluminum (Robert Probert's library article "Where Do White Spots Come From" lists a number of them, as does topic 26113) but in your case these are hopefully just "water spots" as you say: salt stains which can be prevented either via solvent drying (drying in a vapor degreaser, but which may present you with some environmental issues) or by rinsing with deionized water. Best of luck.


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

Seeking Product to Remove Water Spots on Aluminum


Q. I am in manufacturing, using Aluminum to manufacturer my products. Some of the Aluminum was left outside the shop and got wet. Now I have 20 ft Aluminum (Bar or tube) with water spots on it. The only way to clean it, or remove the spots, it is to polish it or (soft)sand it (Buffing wheel).

I would like to know, if there is a liquid product, solvent or any other product out there, that I can buy or order, to clean the water spot and eliminate the buffing or polish we do now to remove the water spots. Please something simple that can be apply in house, with gloves or can be dipped in. Safety is a big issue for myself and our workers.

William Suarez
Tampa, Florida
^- Sorry, this RFQ is outdated
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March 2, 2014 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread

Q. How to remove water stains from aluminium extrusion profile surface.

Masood Khan
Applicator - Riyadh, saudi arabia.

Aluminum gets water spots on only one side of sheets

January 15, 2019

Q. I'm having problem with water spots on my aluminium parts after pre-treatment process before undergoing powder coating. What do you think is the cause of this issue? Just happens on aluminium parts and only one side. Other side OK, also doesn't happen to the side which has been ground. Is it because of pre-treatment process itself, chemical, or material?

Chem Bio
- Perai, Penang, Malaysia

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