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How to Cure Gel Polish Properly: The Full Guide

How to Cure Gel Polish Properly: The Full Guide Curing gel polish correctly is one of the most technically important steps in the entire application process. Undercured gel causes lifting, peeling, dulling and potential sensitisation issues. Overcuring is also possible with some products. Here's everything you need to know about curing gel polish properly every time. What Does Curing Gel Polish Mean? Curing is the process of hardening gel polish using UV or LED light. Gel polish contains photoinitiators — chemicals that react to specific light wavelengths and trigger polymerisation, turning the liquid gel into a solid, durable coating. Without sufficient exposure to the right light, this reaction is incomplete and the gel remains soft, weak and full of unreacted monomers. LED vs UV: Cure Time Differences LED lamp (professional 36W+) — cures Gelish colour coats in 30 seconds. Base coat cures in 5 seconds under the Gelish 18G. UV lamp — cures Gelish colour coats in 2 minutes. Significantly slower and less energy efficient than LED. Professional nail salons use LED lamps almost exclusively. The speed advantage alone — 30 seconds vs 2 minutes per coat — is transformative for service efficiency. Gel Polish Cure Times by Product For Gelish gel polish using a standard professional LED lamp (36W+): Foundation Base Coat — 30 seconds (5 seconds under Gelish 18G) Colour coats — 30 seconds per coat Top It Off top coat — 30 seconds Cat eye gel — 30 seconds after magnetising PolyGel — 60 seconds minimum (check manufacturer guidance) How to Know If Gel Polish Is Fully Cured Correctly cured gel polish should be hard and non-flexible when you press a fingernail gently against an edge. The surface will have an inhibition layer (a slightly tacky feel) which is normal — this is different from undercured gel which feels soft and pliable throughout. Undercured gel may also wrinkle or dimple during or after curing, appear dull, or feel warm and soft immediately after removing from the lamp. If you notice any of these signs, re-cure for an additional 30 seconds and check your lamp power. Common Curing Mistakes Moving the hand during curing — movement while under the lamp can cause shadowing and uneven curing. Keep the hand still and flat under the lamp. Applying too thick a coat — thick coats don't cure fully because the light can't penetrate all the way through. Always apply thin coats. Using a weak or ageing lamp — LED lamps don't degrade like UV bulbs, but very cheap lamps often don't have sufficient power for professional gel polish. Check wattage (minimum 36W). Incorrect hand position — nails should be flat and centred under the lamp's light source. Fingers curved or positioned at the edge of the lamp may not receive full light coverage. Not curing each coat separately — every coat — base coat, each colour coat, top coat — must be cured individually. Stacking uncured coats and curing together does not work. Heat Spikes During Curing Some clients experience a warming or burning sensation during LED curing, particularly on thin or sensitive nails or when using high-wattage lamps. This is called a heat spike and is caused by the exothermic polymerisation reaction generating heat. If a client experiences discomfort during curing: remove the hand from the lamp immediately, allow it to cool, and resume curing with a shorter cure time or lower-power lamp setting. The Gelish 18G has a low-heat mode for exactly this purpose. Never continue curing if a client is in pain. For best curing results, pair Gelish gel polish with the Gelish system. Shop the full Gelish range at Nail Outlet — same-day UK dispatch, free shipping over £50 + VAT. Frequently Asked Questions How do I know if my gel polish is undercured?Undercured gel feels soft or pliable when gently pressed, may appear dull or wrinkled, and often lifts or peels within the first few days of wear. If in doubt, re-cure for an additional 30 seconds. Can I cure gel polish in sunlight?Technically yes — sunlight contains UV wavelengths that will eventually cure gel. However, it's not controlled, consistent or reliable enough for professional use. Always use a proper LED or UV lamp. Does gel polish cure differently in different colours?Very dark pigments (black, very deep red) can absorb some of the LED light and may benefit from a slightly extended cure time. Very light or sheer shades typically cure faster than heavily pigmented dark colours. What happens if I over-cure gel polish?Overcuring can make some gel products brittle, but with standard professional LED lamps and normal cure times this is rarely a practical concern. Follow the manufacturer's recommended cure times.