I've almost entirely stopped using matte spray (the normal name for "anti shine" type sprays) They're tempermental. I now use brush on artists matte varnish watered down a bit. I thing Golden was the brand I was using, but I'm, sure that every country has a similar product in their art supply shops.
It applies quickly, cuts the shine, dries fast and is easy to reapply if you miss a spot. It's not going to be as durable as a polyurethane spray, but like you, I'm dipping my minis, so they're already covered in polyurethane and are already well protected.
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