MDF (Medium Density Fiber Board) is used in many applications. MDF is easy to mill and holds a crisp edge when worked. MDF is for interior trim, cabinets, furniture, shelving, and molding. MDF is less expensive than solid wood and provides a smooth and flat surface. The problem is that when MDF is cut it leaves an exposed end grain that absorbs paint. MDF can be painted using the proper technique to obtain a professional finish.
Instructions
1. Sand the MDF with a fine-grit sanding sponge. Use a 120-grit or 150-grit sanding sponge; it works well for this step. The end grain of MDF must be smoothed and before you prime the surface.
2. Apply a thin layer of drywall compound over the cut edges to seal the end grain. The drywall compound is thin and fills the end grain. The compound sands off easily when dry. Your finger works great for applying the compound to contoured edges.
3. Vacuum the surface of the MDF to remove any dust remaining on the surface. When MDF is cut it produces an extremely fine powder that is slick and will get into the finish. A shop vac can get the dust out of the small cracks and crevices.
4. Wipe the surface of the MDF with a tack cloth just before you are ready to apply the finish.
5. Prime the MDF with a solvent-based primer like lacquer. Do not use a water-based primer; it will raise the grain of the cut surfaces. Use a primer that is easy to sand when dry.
6. Fill any cracks and nail holes with a superior quality painter's putty. Caulk sticks better to painted or primed surfaces so apply the caulk after priming the MDF. Use a caulk gun with a high quality painter's caulk for this step.
7. Sand the surface lightly with a fine sanding sponge. The sanding sponge is flexible and will conform to the surface of the moldings and produce a smooth surface. Do not sand through the surface of the primer.
8. Repeat Steps 2 and step 3 before applying the finish coat of paint. Use a airless paint sprayer for a professional paint finish.
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