Repainting a Front Door That Faces the Ocean Breeze

By the time the hinge pins are out and the door is lying across two sawhorses, the job has mostly been decided. A front door takes the hardest weather of anything on a house in Long Beach, CA, and the paint work on it is slow for a reason, as the notes at long beach painting contractor anytime mailer describe.
Hardware comes off first

Handles, deadbolts, knockers and the strike plate come off before any sanding, because masking around them leaves a ridge of paint that cracks the first time a key turns. Screws go into a labeled cup. The door itself is better flat than hanging, since a flat panel lets enamel level without running into the molding profile.
Sanding to a dull surface

A glossy old finish sheds new paint, so the whole door is scuff sanded until the shine is gone, with a sanding sponge in the panel corners where paper will not reach. Bare patches get sanded back to clean wood. Dings and open grain are filled with spackle or a wood filler, left to cure, and sanded flush. Dust is wiped off with a tack cloth, not a wet rag, which swells the grain.
Bonding primer
A bonding primer goes on bare wood, filled spots and any glossy surface that was only scuffed. It grips where a standard primer lets go, and it seals the fibre against the damp that rolls in with the marine layer. Metal doors and fiberglass skins take the same coat. The primer cures overnight before the topcoat, because enamel over soft primer wrinkles.
Brushing order and sheen
Semi gloss enamel is the usual choice for an entry door, since the harder sheen sheds salt film and wipes clean. The panels are brushed first, the horizontal rails next, and the vertical stiles last, so lap marks land where the eye does not follow them. Two thin coats beat one heavy coat, which sags at the bottom rail. A foam roller at a fine nap can finish the flat areas, with a brush tipping off the edges.
West and south exposure
A door facing west or south near the Queen Mary waterfront takes direct afternoon sun plus salt, and a dark color on that face fades first. Light colors hold longer, and the bottom edge and the top edge, which rarely get painted, need the same primer and coats as the face. Sealed edges keep moisture out of the core, and a door sealed on all six sides outlasts one painted only where it shows.