Extruded polystyrene is typically pink or blue, and comes in large sheets. It cuts easily and can be sanded and painted very well.
Pieces of rigid foam insulation (extruded polystyrene) make great sanding blocks and have the advantage of being easy to shape. Find instructions below to make a sanding block that conforms to your moulding profile. Since most moulding or trim is either SupaWood or pine, this sanding technique works for both.
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