Gel colour types: opaque, jelly, glitter, cat-eye, chrome and thermal explained

Most people start gel with one bottle of opaque colour. Then they walk into a supply shop and find bottles that look alike but behave very differently: jelly, glitter, cat-eye, chrome, thermal and glow. Some need extra equipment, some force decisions before you cure. This lesson separates them type by type. The basic order of a gel manicure is in gel nails at home and is not repeated here.

Safety: everything in this lesson is uncured gel until it has been fully cured. Keep it off skin, wipe spills before curing, cap bottles after use and work with fresh air. If you get itching, redness or blisters around the nails, stop using the product and consult a doctor.

Why they apply differently

Every gel colour is a clear gel with something added: lots of pigment (opaque), little (jelly), reflective flakes (glitter), metallic powder that follows a magnet (cat-eye), or pigment that changes with temperature (thermal). The additive decides three things:

• How far light reaches down. More pigment or flakes means harder to cure, so thinner coats or longer times.
• Whether the surface is smooth. Flakes and powders leave texture the top coat has to fix.
• What you do while it is liquid. Cat-eye and chrome are shaped before the gel sets.

Comparison

Type	Colour coats	Extra kit	What decides the result	Known problem
Opaque	2 thin	None	Thickness of each coat	One thick coat wrinkles and under-cures
Jelly / sheer	2-3 thin	None	Coat count controls depth	Shows marks on the nail; tips look see-through
Glitter	1-2 + top coat 1-2 rounds	None	A top coat that levels the surface	Rough surface, under-cure, hard to remove
Cat-eye	Dark base 1-2 + cat-eye 1	Magnet	Thin layer and magnet distance	Faint or spotty line
Chrome / powders	Colour 1-2 + no-wipe top + powder + sealing top	Chrome powder, applicator, no-wipe top	The top coat under the powder	Dull, clumpy, peels at the tip
Thermal	2-3	None	Thin coats, and realistic expectations	Weak change; tips a different colour from the base
Glow in the dark	2-3, often over a pale colour	None	How much light it got before dark	Looks cloudy by day; weak glow

Opaque

The baseline. Two thin coats, each cured. A patchy first coat is normal; do not fix it with a thick one. Very dark shades (black, deep red, navy) often carry a longer cure time on the label because pigment blocks light. Read the label on that bottle.

Jelly and sheer

Little pigment, so light passes through for a candy look. One coat is a faint tint; two or three thin coats give depth you can control. Easy to apply, no brush marks, but you see everything underneath: white spots, leftover old gel, dust you did not wipe off. To hide those, lay down one thin coat of an opaque nude first, or pick a milky base.

Glitter

Flakes float in the gel, so the surface is never smooth and one thin top coat is rarely enough. Two fixes: a slightly thicker top coat left to self-level before curing, or two rounds of top coat with a cure between.

Flakes block light like dark pigment, so apply thin and use the high end of the label’s cure time. For dense glitter, put a matching opaque underneath and use a single glitter coat, rather than stacking thick layers that are hard to remove.

Cat-eye (magnetic)

The bottle holds metallic powder that follows a magnet. The sequence from a maker’s guide:

1. Apply a dark base colour, 1-2 coats, cured. Black gives the sharpest line; a shade matching the cat-eye gives a softer look.
2. Roll the bottle between your palms to spread the powder. Do not shake it, that makes bubbles.
3. Apply one thin, even coat of cat-eye and do not cure yet.
4. Hold the magnet about 3 mm from the nail without touching the gel, for about 3-5 seconds. Change the angle for a different pattern: a single line, a diagonal, or two magnets on either side for a galaxy.
5. Happy? Cure immediately. Not happy? Brush over to erase and repeat step 4.
6. Top coat, cure.

A maker’s tip: do one finger at a time and flash-cure it for about 10 seconds to lock the pattern before curing the full hand. Cat-eye magnets are strong; keep them away from phones, cards and watches.

Chrome and effect powders

Chrome is not a gel colour but a fine powder rubbed onto a top coat. The sequence:

1. Colour, 1-2 coats, fully cured.
2. Apply a no-wipe top coat and cure it fully. The surface is hard but still warm.
3. Rub the powder on with a sponge applicator or a gloved fingertip. Use a little, let the colour show through, spread evenly.
4. Brush off the excess.
5. Apply another layer of top coat, cap the free edge well, cure.

Two warnings from makers: a top coat with a sticky layer turns chrome into dull clumps, and never wipe with alcohol before rubbing, because it cools the nail and the powder will not take. The free edge is where chrome peels first; cap it in both top coat rounds.

Thermal (colour changes with temperature)

Inside are pigments called leuco dyes, sealed in microcapsules about 1-10 microns across. Cold, the dye has colour; warm, it turns clear and you see only the ordinary pigment mixed in. That is why nail tips, cooler than the base, are often a different colour. Normal, not a mistake.

Apply 2-3 thin coats. A thick layer changes slowly and unevenly because temperature does not reach through it. Many thermals are sheer; wearing them over a pale colour makes the change easier to see.

Glow in the dark

Phosphorescent pigment stores energy from light and releases it slowly in the dark, like a light battery: the brighter the light beforehand, the brighter and longer the glow. By day the pigment makes colour look cloudy or faintly green, so it is usually worn over a pale shade or as a top layer. Apply 2-3 thin coats. Brightness and glow time vary a lot between formulas.

Worked example: planning two hands, two types

Assume a 60-second cure per layer.

Step	Left hand, opaque	Right hand, cat-eye
Base	1 coat, cure 60	1 coat, cure 60
Colour	2 coats, cure 120	black base 2 coats, cure 120
Effect	-	cat-eye 1 coat + magnet 5 fingers x 5 s, cure 60
Top	1 coat, cure 60	1 coat, cure 60
Total curing	240 s = 4 min	300 s = 5 min

Cat-eye adds one layer of curing time, plus a decision before curing, which is where beginners slip far more often than on timing.

Common mistakes

What you see	Types	Cause	Fix
Wrinkles after curing	Opaque, glitter, dark shades	Thick coat, light does not reach down	Thinner coats, longest label time
Marks on the nail show through	Jelly, thermal	Sheer gel, nail not cleaned	Wipe all dust, or lay a thin nude underneath
Rough, not glossy	Glitter, chrome	Top coat too thin	Slightly thicker top or two rounds
Magnet pattern will not show	Cat-eye	Thick layer, magnet too far, waited too long	Thinner, 3 mm, cure right after
Chrome dull and clumpy	Chrome	Sticky-layer top coat, or alcohol wipe before rubbing	No-wipe top, full cure, rub while warm
Chrome peels at the tip	Chrome	Edge not capped	Cap the free edge in both top coat rounds
Thermal never changes	Thermal	Thick layer, or the room is the same temperature as your hands	Thinner coats; test by dipping in cold water

Next lesson: picking a nail colour for your skin tone, which colour families make hands look brighter.

Sources

• Pink Gellac, How to apply cat eye polish
• Insight Cosmetics, Chrome powder knowledge page
• Lab Muffin Beauty Science, How do thermal polishes work