I will show you the best way to prep and prime MDF so you can get a great finish with water based top coat paints. MDF is made of glue and wood fibres. When you use water based primer, the water causes the fibres to expand. The best way to avoid this is to use a solvent based primer. A shellac based primer works great for latex paints. The primer dries fast and is easy to sand. It usually takes a few coats. It is best to sand and touch up between coats.

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