Painting a front door with a roller would leave streaks in the panel areas as well as not painting all of the panels of wooden door paint design. Painting a front door with brush too will not give the desired results, brush marks will be visible & the finish may not be unifor, The best way to paint your front door is with spray-gun compressor arrangement where the finish comes out to smooth & uniform. Usually pigmented 2k Polyurethane system for Wood to be used & proper surface preparation using Wood Putty to fill up dents, cracks, holes & correct the surface imperfections, isolant primer to improve the performance of the coating & prevents leaching of glues, resins, tannins & other chemicals which are there in the substrate & has a tendency to move up & destroy the finish. Both gloss & matt variants can be obtained. This apart pigmented Polyester coating can also be applied if some-one wants mirror like finish!!!