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Problem Solver - Polystyrene
Other Problems
Polystyrene (Expanded Polystyrne Foam) is often used in coving or as ceiling tiles It is made from a plastic base
Preparation
Ensure surface is sound dry and clean
If any mould or mildew is apparent, treat with a suitable fungicidal solution, rinse again with clean water and allow to dry.
Basecoat
Once the surface is clean and all loose material has been removed, apply a thinned first coat of emulsion to satisfy the porosity (Thinned up to 10% Clean Water)
Topcoat
Apply an appropriate topcoat and allow to dry, followed by a 2nd coat to finish.