Staining and Finishing Fiberglass Doors Staining and Finishing Fiberglass Doors

What You'll Need
Center punch
Phillips screwdriver
Safety glasses
Rubber gloves

Fiberglass doors are the best alternatives to wooden doors. Fiberglass can withstand extreme climatic conditions as well as corrosive conditions. Fiberglass doors do not warp, split or rot and are also eco-friendly. They can be stained to look like real wood, provided you give them a good finishing.

Follow the guidelines given below to stain and finish fiberglass doors:

Materials and Equipments Required

For Coating

  • Mineral spirits or acetone
  • Lint-free rags or cheese cloth (recommended)
  • Stir sticks
  • 2-inch-wide foam brush
  • Masking tape
  • Stains (Opaque oil-based stain or Gel stains (optional))
  • Polyurethane sealant
  • 2.5-inch-wide china bristle brush

Staining Method for Fiberglass Wood:

Step 1 – Preparing the Door

If you are buying a new door, staining and finishing needs to be done prior to installation. If the door is already installed, it needs to be removed from the frame. This can be done by using a center punch and a hammer. Use a pair of pliers, grasp the hinge leaf pin with it and pull the pin out by twisting.

Step 2 – Clean the Door Surface

Clean the surface of the door to get rid of dust, debris, and other surface contaminants. For best results and optimum coating adhesion, thoroughly clean the door panel and sidelite(s) with mineral spirits or acetone. Use a mask tape to cover surfaces where staining is not required.

Step 3 – Door Staining Process

 Stir the stain in a container with stirring sticks for 3 to 4 minutes until a thick creamy mixture is obtained. Try staining a corner of the door to determine if this is the desired shade. If everything is satisfactory, the door staining process can be started:

    First Coat

  • Using a china bristle brush, start applying the stain on individual sections of the door. A rag can also be used for staining, but it is recommended only for professionals.
  • Strokes should be short and even, which will spread the stain evenly.
  • If required, wipe excess stain with rags.
  • Once you have finished staining the entire door, evenly spread the stain coat using a foam brush.

    Second Coat

  • The door should be completely dry before a new coat is applied.
  • Ideally 2 to 5 coats should be applied to obtain the desired shade.
  • To achieve darker shades, simply apply more coats as described above. 

Step 4 Finishing

After the staining process is completed and the door has dried out completely, you can finish the door. The finishing sealant should be applied as follows:

  • Dip the brush in sealant, and remove excess sealant from brush by gently squeezing it.
  • Apply the sealant onto the surface using gentle strokes.
  • To even out the grains, apply another coat of finishing sealant.
  • Once the initial coat dries completely, start applying the second coat as explained.

Important Tips

  • Never shake the containers holding the stain or sealant.
  • Wear rubber gloves and safety glasses to protect your hands and eyes. 

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