Repairing exterior rust on steel tanks

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Interior shot blasting does not require a new hydro. Although the only people really capable of doing it right with the correct media which doesn't remove any metal (just the corrosion) is a hydro shop. Mine has blasted the epoxy liner out of a couple of lp72s for me, way easier than burning out my tumbler with days of rolling.
Well then I guess the hydro shop I used to use lied to me then because that's the info I got.
 
https://www.shearwater.com/products/perdix-ai/

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