How to Install a Door Lock

7 steps to a flawless front door: 1. Sand. If it’s already painted, you definitely want to sand the door down at least slightly, more if needed. If it’s not an already painted surface, you at least want to scuff it up a little before adding primer. 2. Prime. You don’t want to skip on the primer if your door has never been painted before. The last thing you need is all of your hard work to peel off at some point. Start with the best primer now to prevent this from happening. I used STIX on my fro