Wayne Parham Messages: 18727 Registered: January 2001
Illuminati (33rd Degree)
MDF is usually OK if it isn't exposed to liquid water. It may swell a very slight amount in high humidity, but it won't become weak. But if you put a veneer on it, the slight swelling is sometimes just enough to see a ridge forming under the veneer at the seam of butt joints after a period of time. This can be solved using mitered joints so that the only seam is at the corner.