Testors Dull Cote
Since Games Workshop stopped selling a Matt Varnish, which was excellent. I have struggled to find a comparable product. I did try Humbrol Matt Cote, but found that for metal miniatures this left a sticky residue which remained on the miniature for many weeks. I even had to strip and re-paint my Ogre Kingdoms Tyrant, because the sticky residue which was still on the miniature for weeks after being applied.
This stuff is excellent even better than the Matt Varnish from Games Workshop. The matt finish is brilliant. I will from now on varnish all my miniatures with the Games Workshop gloss varnish first and then spray on a coat of Testors Dull Cote and it really does matt the gloss finish down very nicely.