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On 3/18/16 4:06 PM, Roger (K8RI) on TT wrote:
 
Is there anything that will keep an antenna shiny and bright, besides
not putting it up?
I have often heard clear Krylon mentioned, but from my experience, it is
very short lived.  Three coats, allowed to dry between coats only lasted
a few months if that.
Around here (central MI) the shiny Al turns to a dull finish in a month
or two.
Alodyne does last and looks good, if you like a shiny gold color and
have both time and ambition.  I have used Alodyne on aircraft elevator
hinges.  It's a very labor intensive (tedious) process. The antenna
would certainly stand out.
 
There's  variety of chemical conversion coatings in all manner of 
colors; one of them must be "silver". 
You might look at what they use for mirrors used with solar 
collectors: it's important that they stay high reflectivity.  It might 
be some sort of clear aluminum oxide coating that's formed by carefully 
controlling the oxidation process. 
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