Yes, Protectapeel can be applied to non-porous door and window frames to protect from damage caused by scratching, plaster, or weather exposure. Before full application, you must always apply the Protectapeel product to a small test area to test the substrate’s suitability. You must ensure that all substrates are well covered. Allow the product to dry for 48 hours, and then check that the Protectapeel product will peel away from each substrate.