Prep Steps for Glossy Trim and Old Doors

Two hours of sanding and one hour of degreasing is the labour on a standard six panel door, and the notes at long beach interior painting andrew h moeller describe it as the step most often skipped on interior painting in older Long Beach, CA houses. Everything about how trim wears depends on those hours.

Degrease before anything else

Trim and doors near a kitchen or a hallway carry a film of cooking oil and hand grease. Sanding spreads that film into the wood instead of removing it, so a degreaser or a deglosser goes on first and is rinsed off with clean water. The surface is left to dry fully before the next step.

Scuff sanding glossy enamel

Old semi gloss enamel is too slick for new paint to grip. A scuff sand with fine paper dulls the whole surface so the primer has something to hold. The goal is a uniform haze, not bare wood, and the dust is wiped with a tack cloth or a damp rag before moving on.

Chipped edges and bare wood

Where the old coats have lifted, the edge is feathered with sanding until a fingertip cannot feel the step. Bare wood gets a spot of primer, since raw wood drinks topcoat and shows a dull patch under a glossy finish. Deep dents and old nail holes are filled with spackle or wood filler, sanded flush and spot primed again.

Caulk at the joints

Gaps between the casing and the wall are filled with a paintable acrylic caulk and smoothed with a wet finger. Gaps in the trim's own mitered corners get the same treatment. The caulk is left to skin over before painting, which in humid Long Beach weather can take longer than the label suggests.

Primer and enamel

A bonding primer goes over the scuffed surface, and then two coats of acrylic latex enamel in semi gloss or satin. Latex enamels level well and stay clear of the yellowing that oil based paint shows in a room with little sun. A light scuff sand between the coats leaves a smooth finish that still reads clean at arm's length.

Order of work on a door

Doors are laid out so the panels and edges are done in sequence: the recessed panels first, then the horizontal rails, then the vertical stiles, and the edges last. Each step is brushed out before it skins, so the finish dries without a ridge where one section meets another. A door painted in the wrong order shows lap lines in raking light.