If you want to give the slabs a lift try cleaning them with some brick cleaner. I had some old grey slabs, well black and green really, cleaned them up with brick cleaner now they look really good.
Well, they look not so bad now that I think about it. I re-paved the path turning the slabs over, and the other side looks remarkably clean and free of mold.
So I think I'll abandon the painting idea altogether. Thanks for everyone's input!
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