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When we moved in to our home an interior brick wall had been painted over with some type of opaque white paint.

I decided to limewash the wall - a coat of prep coat and two coats of limewash. It looked patchy so I repeated the prep and limewash and it still looks awful.

I now want to paint it with regular paint from Farrow and Ball that matches our limewashed walls, but am very confused as to how to do this and prep the wall - I also am an expat in my country so assistance at the home improvement store in English is limited.

Do I absolutely need to sand the surface? What kind of primer should I use - I bought this one, does this work? https://www.gamma.nl/assortiment/gammavoorstrijk-binnen-2-5-liter/p/B111523?store=%7Bstore_code%7D&gclid=EAIaIQobChMIgPTS7YDzgQMVekRBAh3C2g7ZEAQYAiABEgKbw_D_BwE&gclsrc=aw.ds

Can I use an acrylic paint?

Kiki
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Limewash (whitewash) is designed to be easily removable. All paints chalk to some extent, continually exposing a new, clean, unoxidized surface; some are designed specifically to leave a chalking, matte surface.

Painting over a chalking surface is pointless -- the new paint will cohere in large flakes, and rather than adhere to the substrate, will peel off in blotches.

As for sanding brick, that might not help much, since paint penetrates the large pores. Chemical paint stripping is likely needed. Use caution! Effective strippers are highly caustic, quickly harming skin and eyes.

DrMoishe Pippik
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Remove what you can then get some BONDING primer over the substrate before applying your paint primer then apply your finish. The BONDING primer is essential for porous substrates. It will penetrate the brick and seal its porous surface tight for for primer/finish paint. You’ll have a much more consistent finish and look on that project. You’ll want to brush the bonding primer so that you can work it into the surface for maximum adhesion.

gratefulseedsaver No GMO
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