Plaster walls are one of the best things about an older home: solid, quiet, and with a slightly hand-made texture drywall can't copy. They're also the walls that most often look worse after a quick paint job. Hairline cracks telegraph through new paint, old patches show as dull spots, and some original finishes won't let modern paint stick at all. Here's how we approach plaster in DMV homes built before the 1950s.
READ THE CRACKS
- Hairline cracks are normal settling. They can be filled and painted.
- Cracks that reopen every year follow seasonal movement and need a flexible repair: open the crack slightly, set fiberglass mesh tape in setting compound, and feather it out.
- Bulges or spongy spots mean the plaster has separated from the lath. Press gently: if it moves, it needs to be re-attached with plaster washers before any painting.
- Long diagonal cracks from door corners can point to structural movement worth having looked at.
USE THE RIGHT PATCHING MATERIAL
Lightweight spackle and premixed drywall mud shrink and sit softer than plaster around them, which is why patches show. For anything bigger than a nail hole, a setting-type joint compound (the powder you mix with water) bonds better and dries hard enough to match. Deep holes are filled in layers.
THE PRIMER QUESTION
| What You Find | What to Prime With |
|---|---|
| Sound latex paint | Standard bonding primer on patches, then paint |
| Old oil-based paint (glossy, hard) | Light sanding plus a bonding primer, or latex will peel |
| Chalky surface that rubs off on your hand | Likely calcimine or distemper: wash it off or seal with an oil or shellac primer |
| Water stains or smoke | Stain-blocking oil or shellac primer |
A quick test for old oil paint: rub a small spot with a cotton ball and rubbing alcohol. If paint comes off, it's latex. If nothing happens, it's likely oil-based.
Homes built before 1978 may have lead-based paint somewhere under the newer layers. Test before sanding or scraping, and don't dry-sand old painted plaster. Inexpensive test kits exist, and any painting contractor working on a pre-1978 home should follow lead-safe practices.
FINISH CHOICE
Flat and matte finishes are kind to plaster's natural waviness, while eggshell and satin highlight every ripple when light rakes across the wall. In older homes we usually recommend matte for walls and a satin or semi-gloss on trim. Our guide to choosing a paint finish goes room by room.
WHAT IT COSTS
Plaster rooms typically run 15–35% more than drywall rooms of the same size, almost all of it in prep: crack repair, re-securing loose areas and priming. For overall room pricing, see our interior painting cost guide.
RELATED READING
HOW TO HANG A HEAVY MIRROR ON PLASTER WALLS
The anchors, drilling technique and weight limits that keep old plaster from cracking.
INTERIOR PAINTING COST IN DC, MD & VA (2026 GUIDE)
Everything you need to know about painting costs in the DMV area, from single rooms to whole-house projects.
HOW TO PREPARE YOUR HOME FOR INTERIOR PAINTERS
What to move, what to leave, and what to tell your painter before the crew arrives — a practical checklist.
Planning a project? See our Interior Painting service page for scope, process and recent work.
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