I used two coats to get an opaque finish but it is quite opaque with just one so if you're looking for a matte black you can stamp with, this could be it!
I didn't really know what to do with this polish so I chose a few different gold embellishments to put on top of it cos gold and black is one of my favourite colour combos. On my index finger I used gold caviar beads, on my middle finger I used some gold leaf and on my pinky finger I used a gold spike.
Over the embellishments I used one coat of models own matt top coat to secure them.
If you have a favourite matt black polish, let me know in the comments :)