Nail extensions with dual forms are a technique where gel or polygel is not applied directly onto the nail, but placed into a clear form that is pressed onto the prepared nail and cured in the lamp. Once the form is removed, you are left with a nail that is already shaped, with a smooth surface and an even apex, so far less filing is needed than when sculpting on bottom forms.
What are dual forms
Dual forms (also sold in shops as top forms) are flexible plastic templates whose inner side mirrors the surface of the finished nail. The product is placed inside the form, the form is pressed onto the nail, and the gel cures already in its final shape: the apex, the side walls and the free-edge length.
A set contains several sizes so that you can find the right fit for every finger. For example, the Express top forms set includes 10 sizes. The forms can be used more than once if you clean them after use and store them without scratches: every scratch on the inside of the form is transferred onto the surface of the nail.
How they differ from bottom forms and tips
- Bottom forms are slipped under the free edge, and the nail is sculpted with a brush from above. This gives the most freedom when creating the shape, but it takes more skill and more filing.
- Tips are glued to the end of the nail and covered with gel. This is quick, but the shape is limited by the tip itself, and the glue zone becomes one more place where the coating can lift.
- Dual forms immediately give a uniform shape on all ten nails. They are especially convenient when you want an even length and apex, and for short and medium-length nails.
We covered the differences between the materials themselves in the article "Nail extensions: gel, acrylic or PolyGel", so here we only talk about technique.
Which gels work with dual forms
The product needs to be thick enough to stay in place in the form and not run into the cuticles when you press the form onto the nail.
- Polygel (acrylic gel) is the most common choice. It does not run, and it is easy to spread inside the form with a brush dampened in a special liquid. In the PolyGel system category you will find polygel, Solvent liquid for dampening the brush, and a tool with a spatula and a brush.
- Builder (sculpting) gel works only if it is a thicker, self-levelling-free gel that does not run on its own. A runny gel "flows" in the form and is hard to control.
You will find sculpting gels in the gel system category. Always take the curing time from the description of the specific gel, as it depends on both the product and the lamp.
Choosing the form size
Choose the size by the width of the nail at its widest point, not by its length.
- Hold an empty form against the nail and look from the front: its side edges should line up with the side walls of the nail.
- A form that is too narrow will squeeze the sides and the product will spill onto the skin. A form that is too wide will make the nail wider and leave gaps at the sides.
- If you are torn between two sizes, choose the slightly narrower one and adjust the sides with a file if needed.
- Before you start, lay out all ten forms in finger order so you do not have to search for them once they are filled.
For which shape to choose based on finger length and nail bed, see our nail shapes guide.
Nail extensions with dual forms step by step
- Prepare the nail. Push back the cuticles, remove the dead cuticle from the nail plate, remove the shine with a file and wipe away the dust.
- Dehydrate and apply the adhesion product. First the dehydrator, then primer or bonder, without touching the skin. We explained how these products differ in the article on primer, dehydrator and cleanser.
- Apply a thin layer of base or gel and cure it. This layer helps the product from the form bond better to the nail.
- Fill the form. With a spatula, place product inside the form at the future free edge and use a brush to spread it towards the cuticle area. The layer should be thin by the cuticles, with the thickest point in the stress zone, where the nail turns into the free edge.
- Apply the form. Hold it at roughly a 45-degree angle, first touch it to the cuticle area and only then slowly lower it towards the tip of the nail. This pushes the air out instead of trapping it inside.
- Check the position. Look from the side and from the front to make sure the form is centred and not tilted. Clean away any product that has spilled out by the cuticles or sides with a brush or stick before curing.
- Cure. While holding the form in place, put the finger in the lamp. After removing the form, cure the nail again if the product manufacturer instructs so.
- Finish. File the free edge and sides, wipe off the sticky layer (if there is one) and apply top coat or gel polish.
The lamp must suit the product you are using, otherwise the gel may not cure fully. You will find a suitable model in the UV/LED lamps category.
French manicure with dual forms
Dual forms let you create a crisp "smile line" without painting it on the nail.
- Place a little white gel or polygel at the tip of the form and use a brush to shape the smile line inside the form.
- Briefly cure the empty form so that the white part does not mix with the other product.
- Fill the rest of the form with a natural-shade cover gel and apply the form to the nail as described above.
The line is identical on every finger because it is shaped not by hand on the nail, but by the edge of the same form. You will find more options in the article "French manicure with gel polish".
Most common mistakes: air bubbles, an edge that is too thick
- Air bubbles. They appear when the form is applied across its whole surface at once or when there is too little product. Lower the form from the cuticles towards the tip and use a little more product.
- Edge too thick. Excess product has gathered at the end of the form. The thickest point should be in the stress zone, not at the free edge.
- Product on the cuticles. The form is too narrow or too much product was placed by the cuticles. Gel on the skin not only causes lifting: contact of uncured product with the skin is one of the most common causes of allergy.
- Crooked nail. The form was applied tilted. Before curing, look at the finger from the front, from the tip side.
- Lifting after a few days. Preparation is usually to blame: leftover shine, oils or dead cuticle on the nail plate.
When the grown-out part by the cuticles becomes noticeable, the nails need a rebalance: fill in the grown-out area and restore the apex.
Frequently asked questions
How do you do nail extensions with dual forms?
Prepare and dehydrate the nail, apply the adhesion product and a thin base. Place thick gel or polygel in the form, press it from the cuticles towards the tip, clean away the excess and cure in the lamp. After removing the form, file the edge and apply top coat.
Which gel works with dual forms?
A thick one that does not run: polygel (acrylic gel) or a thick builder gel. A runny gel flows out of the form and is hard to control.
Are dual forms suitable for beginners?
Yes, it is one of the simpler extension methods, because the form itself provides the shape. At the start, most of the time goes on choosing the size and getting a feel for the amount of product, so practise first on a tip or a training hand.
How do you do a French manicure with dual forms?
Shape white gel at the tip of the form and cure briefly, then fill the rest with natural-shade gel and apply the form to the nail.