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To fix the patio door reveals, start by removing any loose plaster and cleaning the surface. Trim the expanding foam flush with the wall and install a corner bead for neat edges. For plastering, use Thistle’s ‘Multi-Finish’ plaster, applying a bonding agent first if needed. Smooth and feather the plaster with a trowel, let it dry, then sand it lightly before painting or wallpapering. If you’re unsure, it might be worth consulting a professional.