I have not had to sandblast it yet, but I hear it is a bigger.
One of my favorite uses for the stuff is on rims. I just finished the 7 split rims for my deuce. Sandblasted, POR-15, then painted with the gillespie semi gloss makes for a nice smooth surface to install the fresh rubber.
I had a tractor tire blow it's inner tube last year, and it leaked the calcium for quite a while before I got around to changing it. Of course by then the calcium had eaten through the rim. After sandblasting (and the sandblaster will not lie about rust through) I patched the holes, ground them smooth, and then gave a heavy coat of the POR-15. Should it happen again, hopefully the POR15 will have done it's job and protected the rim from any deterioration. It's an old tractor, but it's the only one I got.
I use it on just about every rim I take apart at the museum. Time will tell if it's the correct move. It will be nice for the next guy doing tires that he will not be having to take a chipping hammer to the rim before assembly.
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