Looks almost like some sort of netting. If it's a painted camo, I wonder if you could lay a piece of mesh of the right pitch down on the under color and spray the top color over it. Might take a bit of doing, but I'll bet it would work.
This one looks like a cool one, and I'm still waiting for their Pz I B to hit the shelves!
Bill
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DML M4A2 Red Army
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-- There is a fine line between "hobby" and "mental illness". (Author unknown)