I've not seen anything made from aluminum that would make a solid mash paddle... At least not yet. It's easy to get/make a wood paddle, it's also very easy to buy a SS (or make one if you have the right tools) paddle.
IF you can locate something that will work, or you think will work, try it out. I would just put it into some boiling water (enough to cover beyond where you think wort will ever touch it) for a solid 30-45 minutes before you use it the first time. I would also make sure that it's not going to scrape your mash tun (if it's a converted cooler)... If you're using a keggle/kettle mash tun, you shouldn't have any issues there.
I've been thinking about converting one of the spears I pulled from the Sanke kegs into a mash paddle... Just don't have the tools where I am to do it. Of course, I could [probably] just go to a welding/machine shop and get them to adapt it...
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Hopping Tango Brewery
"Do you wanna get hiiiigh?" - Towelie
On Tap: MO SMaSH, English Brown Ale, Dark Cream Ale
Waiting/Carbonating: MO SMaSH
Primaries
K1: Caramel Cream Ale
K2: Mocha Porter
K3:
K4:
K5:
Aging: Wee Honey MkII, mead and maple wine, mocha madness II, Old Ale (on medium toast cherry wood)
On Deck: mocha porter
Mead [bottled]:Oaked Wildflower Traditional, Mocha Madness, Wildflower Traditional, Blackberry Melomel
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