Hi Julie!
I've heard of it, and have spoken to a few knifemakers who have tried it.
From what I've heard, it does it's specific job well, but it does have some drawbacks.... First, items have the tendency to "flash rust" if you don't take the time to rinse, dry, and oil/lube/wax whatever you put in it, immediately after you take the item(s) out of it.
It's ONLY a rust remover....once the item(s) are removed from the product, additional steps are required to ensure rust doesn't return.
If a person doesn't have another method (such as a bead blast cabinet), then this stuff might be a good solution. If you decide to go with it, come back and give us your opinion.....I suspect it might have some good applications in the knife shop.
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