It's pretty thick, like a cake mix. I pour it all along one edge of the panel, then tip the panel up and let it slide down the surface until it reaches the bottom, I turn it 45 degrees and let it settle in that direction. When it's all flat and smooth, I get rid of any air bubbles by spritzing it quickly with some surgical alcohol (warning, kids: don't drink this!).
The acrylic matte medium is mixed in with a little white acrylic paint, so that it masks the circle painting, but not entirely:
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