How to Paint MDF Boards

MDF boards are medium density wood made up of hardwood and softwood fibers, mixed with various resins. MDF is denser than plywood or hardwoods, and is also heavier, but is less expensive and may be used in making various pieces of furniture. MDF is easy to work with, but painting may be more problematic, due to the porous exterior of the boards. The use of a primer is necessary to obtain satisfactory results.

Step 1 – Sand the Surface

The MDF boards should have a softer surface prior to painting. Remove dust and debris from the board, and then sand with a rough grit sandpaper. Wear a protective mask and goggles, to make sure you don’t inhale the dust and prevent it from entering your eyes. Wipe the surface with a clean piece of cloth, and then use a finer grit sandpaper on the surface. If you use a sander, you will finish the job faster.

Step 2 – Clean the Surface

Use a moist piece of cloth to wipe the MDF boards, making sure to remove all dust particles. Allow the board to dry before you proceed.

Step 3 – Apply Primer

Primer is not always necessary when painting wood, but in the case of MDF boards primer is a must. The surface of MDF boards is highly absorbent and the boards may require several coats of paint and may not have the desired look unless a primer is used. The primer will saturate the fibers of the boards and will make the paint more durable. You may choose an acrylic primer or an oil based primer. The acrylic primer is easier to use and suitable if you want to use acrylic paint. The oil based primer requires a longer time to dry. Apply 1 coat of primer with a paint brush. If the surface of MDF you have to paint is larger, you can save time using a paint roller. Wait for the surface to dry. Sand with a 220 grit sandpaper and apply a second coat of primer. MDF requires 2 or more coats of primer. Some MDF boards are pre-primed, but may be more expensive.

Step 4 – Apply Paint

If you have used a water based primer, you have to go with an acrylic paint. Use oil paints if you have used an oil based primer. Apply a thin coat using a paintbrush. Allow the boards to dry and sand lightly. Apply a second coat of paint. If you are using an oil based paint, you don’t need an additional finish. Clean your oil paint paintbrushes using solvent. If you use water based paints, the brushes can be cleaned with water and soap.