"DIY-esque" question: refinishing cast aluminum horns?

The hardest thing about this post is figuring out in which forum to put it!
I have found the treble horns of my (affordable) dreams: the 2" throat Emilar EH500-2.
I have managed to acquire a pair of them, but both of the ones that are now mine (bwahahahahah! mine, all mine!!
) are suffereing from pretty serious loss of paint.
The horns are cast aluminum & appear to have been unprimed. The satin black pain that's on them is not well adhered.
DSC_7249 (2) by Mark Hardy, on Flickr
My question: is there a straightforward DIY way to repaint them (or touch them up).
They don't have to be perfect but it would be nice if they were all black.
The "phase 2" question is: is there a reasonably cost-effective but really "proper" way to have them refinished? I am guessing sandblasting or bead blasting or suchlike would be part of the process(?).
Thanks for any and all suggestions.
PS: FWIW, this is what a "picture perfect", pretty EH500-2 looks like
DSC_6840 by Mark Hardy, on Flickr
I have found the treble horns of my (affordable) dreams: the 2" throat Emilar EH500-2.
I have managed to acquire a pair of them, but both of the ones that are now mine (bwahahahahah! mine, all mine!!

The horns are cast aluminum & appear to have been unprimed. The satin black pain that's on them is not well adhered.

My question: is there a straightforward DIY way to repaint them (or touch them up).
They don't have to be perfect but it would be nice if they were all black.
The "phase 2" question is: is there a reasonably cost-effective but really "proper" way to have them refinished? I am guessing sandblasting or bead blasting or suchlike would be part of the process(?).
Thanks for any and all suggestions.
PS: FWIW, this is what a "picture perfect", pretty EH500-2 looks like


Comments
For outboard and outdrive lower units we used a zinc chromate primer on the fully prepped surface followed by a color matching paint.
We can get into the prep work if you are interested
Keep 'em coming.
PS - hope you really get them singing the way you desire, Doc.
I am tempted to do that -- but that probably goes without saying, as I am one lazy m-o-f-o.
I am -- not displeased -- with the way things are sounding.
Maybe rub a charcoal briquette on them...?
Now I need black paint!!
No worries, I'll start another thread -- I'm sure someone here knows where to get it.
.., and, come to think of it, I did just buy some more charcoal.
Chemists may understand all the lingo but simple minds, such as myself, struggled to understand the compositions.
http://www.wikihow.com/Make-Black
The closest thing to me are trees, mountains, dairy cattle and bears.
... although "firearms" business are big up this a way (Ruger, e.g., has a big facility not too far from us)... so... maybe.
Front: SDA-2ATL forum.polkaudio.com/discussion/143984/my-2as-finally-finished-almost/p1
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Any stripper in particular?
I'm out of my depth here (thus the thread!).
Thanks.
Seriously! You've hit a pop fly with this comment. Talk about a setup
Too good to be true.
Blaze Starr
I remember dad using the Red Devil. Shite would put a hole in your ozone if not done in a well ventilated area.
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