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Old 06-14-2009, 09:51 AM
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Hazy Valve Covers

Didn't know where to put this...so here I am.

I bought a set of 90ish Corvette aluminum valve covers that originally came with a "cast" finish. I like the polished aluminum finish so I spent a lot of elbow-grease and buffer time. They turned out nice.

But, I find that they take on a hazy finish, almost like a coating, after a couple weeks. It buffs off, but even with an application of Mother's aluminum polish, the hazy appearance returns. They've been kept in my basement workshop with a dehumidifier, so dampness shouldn't have been a problem.

Any ideas?

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Old 06-14-2009, 11:11 AM
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Yup, Thems aluminum. Polish them up and give them a clear coat or wax them on a regular basis.
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Old 06-14-2009, 05:09 PM
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Try the new Maguires Mag and Aluminum polish, it's superior to Mothers IMHO.

Vince
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Old 06-14-2009, 05:27 PM
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I'll try it, Vince. As a test, I bought one of the covers up into the garage today to see if some sunlight will have some effect. Of course, they'd get little sun under the hood!

My first thought was there was some sort of chemical reaction to something in the basement. But, I've got another set of polished Corvette covers that have been sitting on the shelf for two years...and not hazy.
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Old 06-14-2009, 06:43 PM
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Quote:
Originally Posted by MI2600
I've got another set of polished Corvette covers that have been sitting on the shelf for two years...and not hazy.
The alloys used are varied in the amounts of magnesium used- the more Mg, the more "haze" will tend to form.
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Old 06-14-2009, 08:55 PM
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Originally Posted by cobalt327
The alloys used are varied in the amounts of magnesium used- the more Mg, the more "haze" will tend to form.
Should I be looking for an Mg cleaner/polish?

Plan B is to sandblast them back to their original look.

Ideas anyone?
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Old 06-15-2009, 01:12 AM
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Quote:
Originally Posted by MI2600
Should I be looking for an Mg cleaner/polish?
No. Mg polish is a misnomer- Mg always turns gray after a while. Any polishing is actually done to the Al.

My thoughts are sandblasting will be of no value, either- unless you want a duller or matte finish as opposed to a bright, polished finish.

You can try the better polishes (the Maguires Mag and Aluminum polish mentioned by 302 Z28 comes highly recommended by others, as well) along w/a sealer, wax, or whatever to prevent air from dulling the finish.

But at the end of the day, the unprotected surface will dull with time.
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Old 06-15-2009, 09:13 AM
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Ok, you and Vince have sold me.
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Old 06-15-2009, 09:31 PM
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I have a set of early Z/28 valve covers on my 34 and I'm getting really tired of keeping them looking nice, been thinking of clear coating them with some left over PPG DCU2002.

Vince
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