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Cupping of MDF Doors
Question
Forum Responses
From contributor M: I have made many MDF one-piece raised panel doors. The problem is very likely due to the type of MDF you use. The density of different brands and types of MDF boards varies throughout its thickness. Relieve material on one side and you create stress imbalance in the board, which causes the warp. The best way to avoid this is to use a type of MDF that is more consistent in density throughout its depth. Panfiber Elite (not to be confused with regular Panfiber) works well. Medex works best of all of the types I have tried so far. These panels are a bit more expensive, but in addition to reducing warp, you will save a ton of time in the sanding and finishing area with either of these boards. It will far outweigh the added cost of the MDF. Try a good high solids primer for profiled pieces, like ML Campbell Clawlock. It is a catalyzed primer, but sands very easily. Also well worth the small added expense when sanding time is taken into account.
From the original questioner: Thanks. Contributor J, the doors were flat after machining. Contributor M, we do use MLC Clawlock. We'll try another set with the MDF you suggested. Would you like to add information to this article? Interested in writing or submitting an article? Have a question about this article? Have you reviewed the related Knowledge Base areas below? 
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