Painting on old redbrick wall, and the owner doesn't want to render.

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Hang on Studio Wall
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Hi all, I'm seeking advice and wisdom please. I have been asked to paint a few murals on a redbrick wall. The wall has been recently pointed but it is old and really would benefit from rendering. The murals are to be of specific footballers, and near life-size, and so the details need to be 'acute' and I don't think that is really possible on an unrendered wall.  Could anyone advise of any options IF the owner decides definitely NOT to have the wall rendered? I was wondering if it is possible/viable to attach large panels to the wall and paint on those.  Basically there are 6 'portrait' murals to be 6 foot by 3, and two 'bookend' murals around 12ft by 3. Thanks in anticipation! 
No, it's not possible - if you were able to do it, and I don't believe anyone would be, the painting would fall off in due course unless you could reliably seal the substrate on which it was painted.  To do this reliably would take a great deal of work, if it were possible at all.  A painting on a crumbling surface is as secure or permanent as the surface itself - all paint can do is stabilize the first surface layer, it can't stabilize the layers beneath it. If the owner doesn't wish to stabilize the wall, you will be wasting your time and his money.
Thank you, Robert, much appreciated.
Crikey....it's  Banksy he wants.  Red brick is porous ,it's got pointing on it and an uneven surface...plus all of Roberts points.  Persuade the guy to have some MDF or similar fixed over the bricks then you have a nice surface to do your portraits on.  Sounds a fun project keep us all posted.hi
Crikey....it's  Banksy he wants.  Red brick is porous ,it's got pointing on it and an uneven surface...plus all of Roberts points.  Persuade the guy to have some MDF or similar fixed over the bricks then you have a nice surface to do your portraits on.  Sounds a fun project keep us all posted.hi
Sylvia Evans on 24/02/2024 20:47:02
Thank you. The MDF suggestion might be the general idea I was meaning when I mentioned affixing panels to the wall. They would need to be quite large but then again, what is large for these sorts of things? Have you seen any examples of it being done, Sylvia?  Thank you v much for replying.
Marine plywood is another option, it won’t warp although very expensive!

Edited
by Alan Bickley