Gel Polish and Curing Lamps

LED against UV

Both cure gel; they emit different wavelengths. LED lamps cure in thirty to sixty seconds and last for years without bulb changes. UV lamps take two minutes or more and need bulbs replaced periodically as they weaken, which is a common hidden cause of gel that stops curing properly. The important point is matching the polish to the lamp: some gels are formulated for one or the other, and a gel cured under the wrong lamp stays tacky or cures only partway, which then peels within days. Check the bottle.

The three-layer system

A base coat that bonds to the nail, color in thin coats, and a top coat that seals the free edge and gives the shine. None is optional. Skipping base coat is why color stains the nail; skipping top coat is why the shine dulls in a week. Two thin color coats always beat one thick one, since thick gel cures unevenly, staying soft underneath while the surface hardens.

Cure times

Follow the polish, not the lamp. Under-curing leaves soft product that lifts and can also irritate the skin, since uncured gel is a known contact allergen. Over-curing is not really a problem beyond a slight brittleness. Cure every layer, including the base and the top. If your gel is consistently peeling in sheets after a few days, under-curing is the first suspect, and old UV bulbs the second.

Why it lifts early

Four reasons, in order of how often they occur. Product touching the cuticle or the sidewall skin, which gives the edge something to catch on. The free edge not capped, meaning the polish was not swiped across the tip of the nail to seal it. Oil or moisture on the nail plate before the base coat. And coats applied too thick. Fixing the first two alone resolves most early lifting.

Removal

File off the shiny top layer, soak cotton in acetone, hold it against the nail with foil or a clip for ten to fifteen minutes, then push the softened gel off gently. It should come away with almost no pressure. If it does not, wrap it again rather than scraping. Peeling gel off pulls layers of natural nail with it, and that is the actual source of the thin, damaged nails people blame on gel itself.