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How to Paint Fiberglass Windows

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How to Stain Fiberglass Windows

Windows made with fiberglass are strong and last a long time. Fiberglass is a material that is made with glass pieces that are held together with resin. The windows made with this material can be changed whenever you want by staining them.

How to Stain Fiberglass Windows


Materials Needed



  • Vacuum

  • Liquid detergent

  • Bucket

  • Clean cloths

  • Painter’s tape

  • Stain

  • Paint stirrer

  • Paintbrushes with soft bristles

  • Sealant



  1. Vacuum the frame to remove any dirt and debris. The area will have to be prepared so you can properly stain the windows.

  2. Pour three squirts of liquid detergent into a bucket of water. Use the soap, water and a clean cloth to clean the windows and frame and as well. Rinse the window and frame with clean water. Dry them with a dry cloth and allow them to dry for several hours.

  3. Tape the glass with painter’s tape. You want to make sure the stain does not get on the window because it can be tough to remove later.

  4. Prepare the stain by stirring it with a paint stirrer. Make sure it is mixed well. The stain should be oil based.

  5. Dip a paintbrush with soft bristles into the stain. Use a small amount of stain to paint a small section of the frame. Make sure you go with the grain when staining the frame. Continue to apply more stain until the entire frame is complete.

  6. Take another paintbrush with soft bristles to go over the frame immediately after you stain it. This will create a smooth and even finish on the frame.

  7. Allow the frame to dry for two complete days. Prepare the sealant by stirring it with a paint stirrer. The sealant should be a polyurethane type made for exterior surfaces. Dip the brush into the sealant and apply it over the frame. You will only need a thin later.

  8. Allow the sealant to dry for one complete day and apply a second layer. Allow the stain to dry for another complete day. Remove the tape.