Do I NEED to varnish before using Streaking Grime?

Since I started producing Grimdark content I have been asked one question more than any others.....
"Do I need to varnish before applying streaking grime?"
Well today it's time to answer this question and to do so lets do some experiments!
How to safely use enamel paints through an airbrush:
• Airbrushing Enamel Pai...
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