Whether molding around doors, walls, and windows is damaged due to rotting, a water leak, or something else, it should be replaced. Baseboards are often easier to replace than door or window molding because they are not usually as ornate. It may take a bit more work to find matching molding. If you are unable to find it, follow the instructions below to make a casting and mold of your original molding.
You will need:
• Painter’s tape
• Polyester resin
• Wall adhesive
• Putty knife
• 2 pieces of scrap wood
• 2 wooden blocks
• Home lubricant
• Utility knife
• Paint color that matches existing molding color
Step 2: Polyester resin is also known as auto body filler and comes in two parts: the resin and a catalyst provided in a small tube. Use the putty knife to mix the resin and catalyst on the scrap piece of wood as directed on the product instructions. The resin will be used to make a casting of the original molding.
Step 3: To ensure that the resin will release, spray the work area on the existing molding with a home lubricant. Spread the resin onto this section of existing molding with the putty knife. Be sure to create a mold at least as large as the missing area and do not worry about being neat. Wait a few minutes for the resin to harden until it becomes semi-rubbery. Use the utility knife to trim the resin to the molding dimensions.
Step 4: Remove the mold by gently pulling it off the existing molding. Prepare the mold for casting by putting it on the second piece of scrap wood and placing a wooden block at each end. Tape the block ends to the flat piece of wood to secure the mold. Spray the mold with the home lubricant.
Step 5: Mix a second batch of polyester resin and pour it into the mold. Let it dry until it is slightly flexible and then remove it from the mold. Use the utility knife to trim off the excess.
Step 6: Use spackle to fill any air bubbles. Let this dry and then sand the piece. Use a wall adhesive to affix this casting to the area where the molding is missing.
Step 7: Paint the casting to match the existing molding and allow the paint to dry.