Unless you’re willing to drill a hole for every single nail, don’t plan on using a hammer. Without a hole, the nail will probably bend in rock-hard MDF. And even if it goes in without bending, the nail will push up a mound of fibre that looks like a mini volcano. A trim nailer, on the other hand, shoots nails through MDF every time. The skinny nails will raise tiny pimples, but you can easily scrape them off with a sharp putty knife before you fill the nail holes.
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Source: Family Handyman