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One of the trade favourites at the moment for this job is Fibrex from guess who. That bit hanging off underneath can be chipped back as far as possible and then skimmed with Fibrex. Although you need to own a plasterers float large enough.
Airhead
hugo7
rhowe
On that note, is there anything you'd recommend as a filler for external painted concrete?
We have a concrete (I assume) overhang porch thing that I need to clean up and repaint. I still have a load of external paint. But it needs cleaning up and prepping.
I haven't had a proper poke at it, but to me it looks like years of multiple layers has lifted. However, there may also be some sort of skim coat.
Cheers.