Friable surfaces will need to be addressed before any works can be started.
A friable surface is one which rubs away when you rub your hand over it. Examples include weathered cement rendering or old weathered brickwork ( known as spalled ). If paint is applied to a friable surface, it will begin to come off with the crumbly parts after time.
A stabilizing solution will be need to applied first to prevent a crumbling surface coat. First brush down the surface with a stiff brush or scrape back with a metal scraper, which will remove any loose debris. The stabilizing solution can then be applied, which soaks deep into the surface acting like a glue, binding it down. A good paint finish is now possible.
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