First, to get a smooth paint finish on MDF, you’ll need to lightly sand it.
Then, seal the MDF before painting with primer to assure a smooth finish.
Before You Begin
Painting MDF cabinets is not as straightforward as you may think.
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The product’s porosity can result in a rough, swollen, or distorted surface texture after painting.
Also, the edges of theMDFtend to siphon up paint, no matter how much is applied.
The key in of paint you use on MDF is also important.
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Oil-based paints will help you achieve the smooth finish you’re looking for.
Water-based paints, on the other hand, are not suited for porous MDF, even after its sealed.
Finally, for a smooth finish, it is best to paint large surfaces of MDF with a roller.
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A foam roller, specifically, will give MDF the smoothest finish.
It needs less sealing.
Plus, you shouldn’t encounter large pits on the surface.
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A better method is to fill the edges with an acrylic polymer-based filler.
Safety Considerations
Always work in a well-ventilated area when using paints, fillers, or coatings.
When sanding, use breathing protection.
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If the 90-degree edges are bumpy or flaky, carefully sand those down as well.
Sanding uncoated MDF too hard will abrade it and make it more difficult to seal and paint.
Apply Sanding Sealer
Stir the sanding sealer to mix.
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Pour the product into a lined paint tray.
Roll the product onto the surface.
Sand Surface
Let the sanding sealer dry for at least one hour.
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The sanding sealer likely has raised the surface of the MDF.
Be careful not to sand through the sanding sealer.
Press the filler deeply into the holes and cracks.
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Let dry for two to three hours.
Tip
Another way to apply filler to MDF edges is to rub it on with a finger.
Wipe down with a dry cloth.
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Add a second coat of filler.
Let this second coat of filler dry longerabout four hours.
Final Sanding
Sand the second coat of edge filler with #320 grit sandpaper.
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Move the sandpaper to the surface of the MDF again and sand that, as well.
Pay special attention to the 90-degree angle between the edge and the surface.
Paint MDF
Wipe down the MDF with a tack cloth.
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Apply paint to the MDF by rolling, brushing, or spraying.
Allow for about an hour between recoats.
Recoat two or three times, if needed.
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Sand the edges lightly in between the primer and the paint to take away the roughness.
MDF comes pre-sanded, however, a light sanding withfine-grade sandpaperwill help the primer and paint adhesion.
