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the process of sanding hide after tanning isnt called "bricking" for nothing.....old red house brick,preferably picked up out of riverbed so has nice rounded edges works well...pumice stone works...

never heard of water blaster being used...never heard of getting them wet once done...BREAKING over a rounded post yes...BRICKING with either brick or pumice stone yes...but never water...

has it dried and have you "worked it"...I had similar results using chemicals multiple times....bottom line,if hair holds and pelt doesnt start to go off...it be fine.