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I haven't, but they're either going to be water or solvent based and likely not include a varnish to suspend them. So you'll probably want to find a suitable base in the form of a varnish that's either water or solvent based, mix them to the consistency you want and use them just like army painter or a pre-made wash. I say this not knowing anything about them, but knowing that most stains are pretty similar things. Have a product link?
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