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Primed wood trim is sometimes cheaper because you can use less expensive wood and use finger joints to join shorter lengths of trim. Some of the headaches of go away versus bare wood. Primed wood will cut the installation time since you won’t have to wait for the primer to dry. It’s easier to spot defects and nail holes on primed trim, so you can fill them before the final coats of paint. It’s even simpler to cope primed trim because the contrast between the raw wood and the painted surface gives you a crisp profile line to follow. So don’t buy raw wood if you’re going to paint.
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Medium-density fiberboard is a popular option for trim because it’s typically the cheapest. It does come with its own set of issues, though. MDF won’t perform as well in wet, humid areas. MDF (medium-density fiberboard) is inexpensive and a great material for painted trim, but only if you’re installing it in a permanently dry place. Installing it near the floor or near windows where water or condensation sometimes collects is a recipe for disaster. The MDF will soak it up like a sponge, expand and shed paint in very short order. So avoid using MDF anywhere at risk for getting wet.
Make things easy to install MDF for your trim project.
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Polystyrene trim is made of rigid foam material and is a cheap, easy-to-work with option for trim, depending on your needs.
Learn what you need to know about working with trim around the house.