I bought some Vallejo Matte spray and some Dullcote brush on and tried them both out on some resin and some Bones. I found I needed to do 2 coats with both to hit missed spots (that's on me not the product) but they both worked very well and they both took away all of the shine of the gloss coat I was putting them over. The Vallejo spray is a big can too. Neither made anything sticky on the resin or the Bones.
I was freaking out because I am working on some Tabletop World stuff and couldn't imagine having to seal it all with a brush on until whenever Dullcote restocks so I am glad the Vallejo spray turned out nice.
So, your mileage may vary but I am happy with both of these. I guess we'll see how things go and if they work out well, I may not switch back to Dullcote when it does restock. I mean, I easily get 3X the amount in the Vallejo can for just a little bit more $$.
If something tragic happens and one of them melts a mini or makes it tacky, I'll update but so far, so good. Have sprayed a handful of things and brushed on some smaller stuff.