Combine Smaller Molding to Create Large Profiles. ... Avoid Using MDF Trim in Moist Places. MDF (medium-density fiberboard) is inexpensive and a great material for painted trim, ...

Step 2 Before coping the next piece, cut an inside miter at 45 degrees to expose the molding's profile. For cutting miters in sprung crown, build a plywood jig that holds the crown upside down and ...

For the windows and doors, Kevin started with square 5 1/2-inch MDF for the casing and added a piece of 1 1/2-inch brick molding on the sides surrounding the opening.