MDF, or medium density fiberboard, is a composite material made of wood fibers and resin. It is often used for cabinetry, furniture, and molding because it is smooth, uniform, and does not warp like wood. MDF is also easy to paint and drill.
One downside of MDF is that it does not hold screws as well as wood. The screw holes are visible after the screw is removed. To hide the screw holes, you can use putty or plugs. Putty can be applied with a putty knife and then sanded smooth once it dries. Plugs are small discs that fit into the hole left by the screw. They can be stained or painted to match the surrounding surface.
Step 1: Sand the Holes. After you have inserted the nails, there may be some mushrooming in the wood surrounding the nail holes
Use a medium-grit sandpaper to smooth out these imperfections.
Step 2: Apply Wood Filler. Once the holes are sanded, apply wood filler with a putty knife.: Be sure to use a color that closely resembles the shade of your MDF board.
Step 3: Let the Filler Dry. Allow the wood filler to dry for at least an hour before proceeding.: This will give you plenty of time to work on other aspects of your project while the filler sets up.
Step 4: Sand the Filled Holes. Use a fine-grit sandpaper to smooth out the filled holes.: You want them to be as flush as possible with the rest of the board.
Step 5: Prime and Paint (Optional). If you are painting your MDF board, now is the time to do it!: Be sure to use a primer designed for use on MDF before applying paint or other topcoats.
Step 2: Clean the Holes
Once you have determined the size and location of the holes that need to be filled, it is time to clean them out. This step is important in order to ensure that the filler material will adhere properly and create a smooth, seamless surface.
Begin by using a small brush or vacuum attachment to remove any sawdust or debris from the hole. If there are any large pieces of wood or MDF still clinging to the sides of the hole, use a sharp knife or chisel to remove them. Once the hole is clean, use a piece of sandpaper to lightly rough up the edges. This will help create a better grip for the filler material.
Step 3: Apply the Wood Putty
To fill the screw holes, apply wood putty with a putty knife. If the putty is too dry, add a few drops of water. Press the putty into the hole and smooth it out so that it is level with the surface of the MDF. Allow the putty to dry for at least two hours before sanding it down.
Step 4: Sand the Holes and Repeat
If your MDF has smooth sides, you may be able to simply s and the holes until they’re flush with the surface. If the sides of your MDF are textured, however, you’ll need to use a filler compound to fill in the holes.
Once you’ve filled the holes, s and them smooth and then repeat steps two and three until the hole is completely filled.