Use 120-grit sandpaper to gently sand the door to get a smoother surface that should take in primer or paint more effortlessly. It can be good to paint slightly outdoors the traces below as it will all be painted more than in any case. After the sides are lined, use http://benjamin-moore-chart-inte81468.bloggactif.com/8166143/interior-painters-cramerton-nc-28032-for-dummies