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Adrian, Black 2.0 is very fragile - I have a bottle and tried a bit last week - it won't stand any wear and tear so really only suitable for the inside of an OTA.
Coreflute being plastic, I wouldn't expect paints to adhere to it well - but spray contact adhesive did, well enough, and failing anything else I'd suggest bonding something to it before you cut it up.
Things I'd consider range from black paper (art suppliers such as Eckersly's) to a black fabric (felt, linen or even silk - from Spotlight).
I resorted to 3mm black foam only because I had a roll lying around.
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