Most DMV homes built before the 1990s have oil-based paint on the trim, doors and sometimes kitchen cabinets. Today almost everyone repaints with water-based (latex or acrylic) paint. You can absolutely do that, but not directly. Latex brushed straight onto glossy oil paint will peel off in sheets, sometimes weeks later.
STEP 1: FIND OUT WHAT'S THERE
Dampen a cotton ball with rubbing alcohol and rub a hidden spot of trim for 15 seconds.
- Paint softens or comes off on the cotton: it's latex. Clean, scuff and repaint normally.
- Nothing comes off: it's oil-based (alkyd). Follow the steps below.
Other clues: oil paint often yellows with age and is very hard and glassy.
Homes built before 1978 may have lead paint on trim. Sanding or scraping lead paint must be done with lead-safe work practices. Test before sanding, especially with kids in the home.
STEP 2: PREP
- Clean with a degreaser to remove hand oils and grime, then rinse.
- Scuff sand with 180–220 grit until the gloss is dull everywhere. You're not removing paint, just giving primer something to grip.
- Vacuum and wipe off dust with a damp cloth.
- Fill and caulk nail holes and gaps.
STEP 3: BONDING PRIMER
This is the step that matters. Use a primer made to stick to glossy oil-based surfaces:
- Oil-based or shellac-based primer: the most reliable bond; also blocks yellowing and stains.
- Waterborne bonding primer: lower odor; works well over properly scuffed surfaces.
Let the primer dry fully, then apply two coats of a quality waterborne alkyd or acrylic enamel in semi-gloss. Waterborne alkyds level out and harden much like the old oil paint did.
HOW TO KNOW IT WORKED
After the paint has cured for a week, press painter's tape firmly on a hidden spot and rip it off. If paint comes off with it, the bond failed.
WHAT IT COSTS
| Job | Typical DMV Cost (Oil-to-Latex Conversion) |
|---|---|
| Baseboards and casing, per room | $350 – $700 |
| Interior door, both sides plus frame | $150 – $275 each |
| Whole-house trim, typical 3-bedroom | $3,000 – $6,500 |
Converting from oil costs more than a routine trim repaint because of the cleaning, sanding and extra primer coat. Doing it once properly means future repaints are simple.
Choosing the color? See the best white paints for trim.
RELATED READING
THE BEST WHITE PAINT FOR TRIM AND DOORS
Warm vs. cool whites, matching trim to walls, sheen, and the whites homeowners actually use.
HOW TO CHOOSE THE RIGHT PAINT FINISH FOR EVERY ROOM
Flat, eggshell, satin, semi-gloss — which finish belongs where and why the wrong choice causes real problems in certain rooms.
PEELING PAINT ON EXTERIOR TRIM: CAUSES AND THE FIX
Why trim paint peels, how to prep and repaint so it lasts, and when to replace the wood.
Planning a project? See our Interior Painting service page for scope, process and recent work.
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