Sand
Final sanding to remove any remaining ridges or tool marks.
Every prep job covers the same ground
Prime
Spot priming over patched or repaired sections.
Inspect
Surface inspection before handing off to your painter.
The difference between good enough and actually ready
Why Unprimed Patches Show Through Paint
Joint compound and drywall paper absorb paint differently than each other, and differently again from an area that's been sanded down to bare compound versus one that hasn't. Paint over a mix of these surfaces without priming first, and you'll often see a faint outline of the patch once the paint dries, painters call this "flashing," and it happens because the unprimed area soaks up paint at a different rate than the surrounding wall, leaving a slightly different sheen behind even when the color matches perfectly. A coat of primer over any patched or repaired area evens out how the surface absorbs paint, so the final coat dries with a consistent sheen across the whole wall instead of a patchwork of dull and glossy patches.
This matters more than people expect on walls that get a lot of direct light, a south-facing wall or a room with big windows will show flashing that a dim hallway would hide completely.
Painting prep FAQs
Do I need primer if I'm using paint with primer built in?
Yes, especially over patched or repaired areas. Paint-and-primer-in-one products aren't a substitute for dedicated primer over fresh joint compound, which absorbs paint differently than the surrounding painted or papered surface and can still flash through without a proper prime coat first.
How soon after drywall finishing can painting start?
Once joint compound is fully dry and sanded smooth, prep work can begin right away. We recommend waiting until compound has cured completely, not just dried on the surface, which can take longer in humid conditions.
Can you tell if a wall is properly prepped just by looking at it?
Not always in normal light. That's why we inspect under raking light, a light held at a low angle, which reveals subtle high spots, sanding marks, and texture inconsistencies that are invisible from a normal viewing angle but become obvious once paint goes on.
Do you paint the walls yourselves, or just prep them?
We handle the prep work, sanding, priming, and surface inspection, so the wall is genuinely ready for paint. We can coordinate with your painter or painting contractor to hand off a surface that's actually ready, not just close enough.