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Just remove any flaking paint with wire brush,scraper, fill any holes with a exterior filler, no need for a undercoat, just need two coats of masonry paint usually. What is ledge stone, concrete, & as long as it hasn't been glossed, then you should be ok.
Beside this, can I use Cuprinol Garden Shades on concrete?
Take the Cuprinol Garden Shades paint range, designed to help you transform wooden sheds, fences, summerhouses, garden furniture and decking. It's brilliant stuff, also being suitable for use on terracotta, stone and weathered concrete.
Besides, do you need to prime concrete before painting?
For a clean and even coat of paint, your concrete surface will need to be thoroughly cleaned before primer is applied. Most primers will dry in a few hours, but home improvement professionals suggest waiting a full eight hours after priming before applying paint just to be sure.
Paint the Concrete. Masonry paint (also called elastomeric paint or elastomeric wall coating) is a good choice for concrete painting because it contains binders that contract and expand with the concrete. Exterior house paint can crack and peel on concrete.