Looks very similar to a stone-chip to me, if not a bit more grainy - Halfords do it in a can it might be worth trying a sample (do you have Halfords in Holland !!)
I put the TV antennas on top of that big concrete tower in Arnhem about 25 years ago and got into a spot of trouble as i tripped off the entire Dutch TV network which began relaying my test signals instead of the TV programming ! Doh. Happy days !





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