How to Paint Over Semi-Gloss Without Sanding

Sanding before repainting a glossy surface exists for one reason: to scuff the slick finish enough that new paint has something to mechanically grip. A liquid deglosser or a purpose-made bonding primer accomplishes the same goal chemically instead of mechanically, which is what makes skipping sanding altogether a legitimate option, not just a shortcut that risks early failure.

1. Clean the surface thoroughly first

Whether sanding or not, this step doesn't change: wash with a degreasing cleaner (TSP or a TSP substitute works well) to remove grease, cooking residue, and general grime — any of that trapped under new paint is a guaranteed adhesion failure point regardless of what primer is used on top.

2. Use a liquid deglosser to chemically etch the surface

Apply liquid deglosser with a rag, following label directions
Wipe in the direction of the grain (on wood trim/doors) or evenly across flat surfaces
No rinsing required — it flashes off as it works

A liquid deglosser is a solvent that chemically softens and dulls a glossy finish, giving new paint something to bite into without physically abrading the surface — this is the direct chemical substitute for sanding, and skipping straight to primer without either step is what actually risks peeling later.

3. Choose a genuine bonding primer

Not every primer is rated for this — the label needs to specifically say "bonding primer" or claim adhesion to glossy, slick, or previously-glossy surfaces. These primers use a different resin chemistry than a standard drywall or all-purpose primer, engineered specifically to adhere to surfaces that would otherwise resist grip. Using a standard primer instead, expecting it to work the same way, is the most common reason this shortcut fails for people who try it.

4. Apply the bonding primer evenly, then topcoat as usual

One coat of bonding primer, allowed to dry per the label, followed by the regular topcoat paint (in whatever sheen is wanted for the finished surface) — no special technique is needed at the topcoat stage once a proper bonding primer is down.

5. When sanding is still the better choice

On a surface with visible flaws — chips, drips, uneven old paint, or a surface that will see heavy physical wear (stair railings, high-traffic doors) — a light sand still produces a smoother, more durable result than deglosser and bonding primer alone, since sanding also physically levels the surface, not just improves adhesion. The no-sand method is best suited to a surface that's already smooth and sound, just glossy.