Why does my garage drywall show every seam?

Many garages were finished with the joints taped and given a single coat of compound, without the extra coats and sanding a living room gets. Paint shows those seams and screw heads plainly. Primer alone will not hide them. If you want the walls smoother, the joints can be finished further before painting, which is drywall repair work rather than painting.

Can the concrete block walls in my garage be painted?

Yes, as long as they are dry and clean. Any white powder, which is efflorescence from moisture moving through the block, is cleaned off and the cause considered first. Block is porous, so it takes a masonry primer or block filler before the finish coats, and it soaks up more paint than drywall.

What is the best color for a garage interior?

A light color, usually a white or very pale neutral. Garages have few windows and often limited lighting, and light walls and a white ceiling make the space noticeably brighter for working and parking. A slightly darker band at the bottom of the walls can hide scuffs from tires, bins and tools.

Is it a problem to paint the wall between the garage and the house?

Painting it is fine. That wall is usually part of the fire separation between the garage and the living space, so holes in it should be repaired properly rather than left open, and cutting into it is a question for your city's building department first. If there are gaps or damage, Ebenezer will point them out at the estimate.

Painting the Inside of a Garage

A garage interior is usually bare or tape-only drywall, concrete block or both, so it needs a primer made for that surface before any color goes on. Choose a light, washable eggshell or satin for the walls and a bright flat or eggshell white overhead, and in a hot inland garage, paint in the cooler hours so the coating stays within the label's temperature range.

For most San Diego homeowners, the garage is a workshop, a laundry room, the place the second fridge lives and the first thing seen when the car pulls in. Yet its walls are often the least finished in the house: drywall that was taped and never painted, a gray concrete block wall, a ceiling that went dim years ago. Painting a garage interior makes it brighter, cleaner to look after and more pleasant to work in, and it brings different surfaces and different problems from a bedroom.

The floor is its own subject. Coatings for the slab are covered under epoxy floors and in epoxy garage floor preparation. Here the subject is the walls and the ceiling.

What makes a garage different to paint?

The surfaces and the conditions. Garage walls are often bare drywall with only taped joints, concrete block, or exposed framing, and each needs its own primer. Garages are not climate-controlled, so in inland neighborhoods they can be hotter in the afternoon than the paint label allows. They are also full of things that must be moved and protected before any painting starts.

Know your surfaces

Tape-only or bare drywall. Many garages were finished with the joints taped and given one coat of compound, sometimes left unpainted for decades. Bare drywall and compound absorb paint very unevenly, so they need a drywall primer before any color. Taped seams and screw heads will still show through paint; if you want smoother walls, the joints can be finished further first, which belongs to stucco, drywall and wood repair.

Concrete block. Common in older homes and on retaining walls that form one side of a garage. Block is porous and rough. It takes a masonry primer or a block filler that seals the pores, and then the finish coats. White powdery deposits on block are efflorescence, a sign that moisture is moving through the wall; the article on white powder on stucco and block walls explains what to do about it.

Exposed framing and old paint. Some older garages have open studs and plywood or a wall painted once, long ago, with whatever was on hand. These are cleaned, checked for loose paint and primed as needed.

The wall shared with the house. This wall, and sometimes the ceiling under a room above, is usually part of the fire separation between the garage and the house. Painting it is fine. Cutting into it is a question for the building department, not the painter, and open holes from old shelving or a removed cabinet should be repaired properly. If they are there, they are noted at the estimate.

Heat in an inland garage

A garage in Santee, El Cajon or Spring Valley can be very hot by mid-afternoon in late summer, especially with a west-facing door taking the sun. Paint labels give a temperature range for both the air and the surface, and a garage wall that has been baking all day can sit at the top of it or beyond. In heat, paint sets before it levels, leaving lap marks and roller texture.

The usual answer is to paint in the morning, keep the garage door partly open for air movement where that is practical, and work around the wall that gets the afternoon sun. Near the coast the problem is the opposite: a cold, damp garage on a marine-layer morning can slow drying, so the work may start later in the day.

Choosing colors and finishes

Surface	Usual choice	Why
Walls	Light color, eggshell or satin	Brighter space; wipes clean
Lower wall band (optional)	Slightly darker, same finish	Hides tire, bin and tool scuffs
Ceiling	Bright white, flat or eggshell	Reflects light from limited fixtures
Doors to the house	Semi-gloss enamel	Handled every day
Block walls	Masonry-suited finish	Breathes and resists moisture

Garages are lit by a couple of fixtures and the open door, so a light color on the walls and a white ceiling make a real difference to how bright the space feels. Both Dunn-Edwards and Sherwin-Williams make interior and masonry products suited to garage walls.

The order of work

Clear the space. The garage is emptied or its contents moved to the center and covered. Who moves what is agreed in advance, so everyone knows what will be ready on the day.
Protect what stays. Water heater, laundry machines, the door opener, outlets and switches are masked or covered. Labels and safety information on appliances are left uncovered and unpainted.
Clean. Garages collect dust, cobwebs and, near the workbench, oil and grease. Walls are cleaned; greasy areas are degreased.
Repair. Holes from old hooks and shelving are filled, damaged drywall is patched, and failed caulk at the door frame is replaced.
Prime bare drywall, compound, block and patches with the primer each surface needs.
Ceiling first, then walls, then the door frames and doors.
Put it back once the walls have dried enough that shelving and hooks will not mark them.

Is it worth it?

A painted garage is brighter, holds less dust, and is more pleasant to spend time in, whether that means a workshop, a home gym or just a cleaner place to carry the groceries through. It is also one of those jobs that people put off for years because it never seems urgent. Every job gets the same care here, and no job is too small, including one garage.

Ebenezer will look at the walls, tell you what each surface needs and how the work fits around your schedule, and give you a free estimate. More on interior painting, or ask for your estimate.