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A gel overlay is a layer of gel applied across the natural nail to give it a smoother, more even surface and a little extra body, without adding length. It is the middle ground between plain gel colour and an extension: your own nails stay the shape they are, but the finish looks tidier and holds up better through the week.
Salons build overlays in soft gel, builder gel or hard gel depending on how much structure you want and whether you prefer soak-off or file-off removal. A set generally looks good for two to four weeks. It is often chosen by people growing out their own length, or by anyone whose nails have ridges or an uneven surface they would like smoothed under colour.
The free edge is shaped, the cuticle area is tidied, the shine is buffed off and the surface is dehydrated. A bonding base is cured first, then the overlay product is floated across the nail — often with a slightly thicker point over the stress area — and cured. The layer is filed smooth, and colour and top coat go on afterwards. How it is taken off depends on the product: soft gel soaks, hard gel is filed back.
It suits people who like their own nail length but want a cleaner surface and colour that lasts, and those who chip regular gel quickly. It is also a common step-down for anyone leaving extensions behind. It is not the service to book if you want added length or a shape your own nails cannot carry — that calls for tips, sculpting or a Gel-X style set.
There is no downtime. The usual problems are an overlay laid too thick, product flooding the skin at the cuticle, or a set left on long past its wear window — all of which encourage lifting, and lifted edges can trap moisture. Go back to the salon for repairs, never peel, and oil the cuticles daily. See a doctor if a nail becomes sore, loose or discoloured, or if the surrounding skin stays red, itchy or swollen.