13.2 Acrylic (Liquid and Powder): Application and Removal
Key Takeaways
Acrylic is a liquid monomer and a powder polymer that polymerize into a hard overlay; standard instruction places a catalyst in the liquid and the initiator, benzoyl peroxide, in the powder.
Standard teaching describes a dry bead as equal parts liquid and powder, a medium bead as about 1.5 parts liquid to 1 part powder, and a wet bead as about 2 to 1, with medium the usual working bead; Chapter 7 sets no ratio.
A three-bead application places product in zone 1 at the free edge, zone 2 over the stress area for the apex, and a small, thin zone 3 bead near the cuticle with a free margin from the skin.
Acrylic is removed by soaking in acetone after the bulk is filed down; acetone is warmed only in a warm-water bath, never in a microwave or near flame, and product is never pried off.
Acrylic, also called liquid-and-powder or monomer liquid and polymer powder enhancement, is one of the two product systems in outline item IV.A.2. The steps below are standard nail-technology instruction from the Milady reference Pearson VUE lists. Pennsylvania Chapter 7 does not set a mix ratio, a monomer by name, or a removal time. The Code sentence that still applies is the ventilation rule in 49 Pa. Code § 7.91.
What the liquid and the powder do
The monomer is the liquid. The polymer is the powder. When the brush carries liquid into powder, the two begin polymerization, a chain reaction that links small molecules into long chains and hardens the bead into a solid overlay. Standard instruction places a catalyst in the liquid to control the set time and an initiator, benzoyl peroxide, in the powder to start the reaction. The reaction gives off heat. A thick layer, a very wet bead, or a thin, damaged plate can make the client feel that heat.
Professional liquids are built on ethyl methacrylate and related monomers. They are still methacrylates, so they sensitize skin with repeated contact and are refused to a client with a methacrylate allergy. FDA reports that in the 1970s it removed products containing 100 percent methyl methacrylate (MMA) monomer from the market through court proceedings after injury complaints, and that no regulation specifically prohibits MMA in cosmetics. MMA cures very hard, is difficult to soak off, and is associated with plate damage. Pennsylvania Chapter 7 does not name it either. Do not use it, and do not invent a Code ban.
The bead and the mix ratio
The mix ratio is the proportion of liquid to powder in a bead. Standard teaching describes three consistencies.
| Bead | Typical teaching ratio | How it behaves |
|---|---|---|
| Dry | About equal parts liquid and powder | Grainy, does not flow, cures brittle and can lift |
| Medium | About 1.5 parts liquid to 1 part powder | Holds a shape, then flows when pressed; the usual working bead |
| Wet | About 2 parts liquid to 1 part powder | Runs toward the folds, cures soft, can cause heat and lifting |
Judge the bead by how it behaves on the nail, not by the numbers alone. Chapter 7 does not publish a ratio.
Preparing the plate
- Inspect, then clean the hands and nails.
- Push back dead cuticle and remove it from the plate. Product over cuticle lifts.
- Remove the surface shine with a fine abrasive. Do not thin the plate.
- Apply dehydrator to remove surface moisture and oil.
- Apply primer sparingly to the natural nail only, if the system uses it. An acid-based primer, often methacrylic acid, is corrosive and can burn skin and eyes. An acid-free or non-acid primer is gentler but is still kept off the skin. FDA notes that methacrylic acid primers have caused poisoning and injury, and that federal rules require child-resistant packaging for household products containing it.
- Attach a tip or fit a form snug under the free edge.
Three zones and three beads
Standard instruction divides the nail into three zones.
| Zone | Where it is | What the bead does |
|---|---|---|
| Zone 1 | Free edge or extension | First bead; builds length and the free-edge line |
| Zone 2 | Stress area, near the smile line | Second bead; creates the apex, the thickest point |
| Zone 3 | Near the cuticle area and sidewalls | Smallest bead; kept thin, with a free margin from the skin |
Place each bead, then press and pat it into shape. Do not drag it like paint. Wipe the brush on the edge of the dappen dish between beads. In a pink-and-white set, white powder builds the free edge and pink or clear powder covers the nail bed, meeting along a curved smile line. Keep product off the cuticle, sidewalls, and hyponychium. Product cured on skin lifts and can sensitize the client.
Curing, filing, and finishing
The overlay is ready to file when it is hard and makes a clicking sound when tapped lightly with the brush handle. File the shape with a coarse file, refine with a medium file, and finish with a buffer, keeping the apex over the stress area. Remove dust, then finish with oil, polish, or a gel top coat as the client wants.
Removing acrylic
Acrylic is removed by soaking in acetone or the product's remover. First reduce the bulk with a file, without filing into the natural plate, so the solvent has less product to break down. Soak only the enhanced nails, in a bowl or with acetone-soaked wraps. Acetone may be warmed by setting its container in a bowl of warm water. Never heat acetone in a microwave or near a flame, because it is highly flammable. Gently push softened product off with a wooden pusher, re-soak whatever stays firm, and never pry or nip the overlay off. Prying tears layers of the natural plate. Condition the nails and skin afterward.
Monomer vapor and filing dust need ventilation under § 7.91. Keep only a small amount of monomer in a covered dappen dish, and follow the safety data sheet for leftover liquid.
Scenario: a hot nail and a wet bead
A client feels heat on two nails a minute after the beads go on, and the product is running toward the sidewalls. Those beads are too wet and too thick near a thin plate. Lift the wet product off the skin before it cures, wipe the brush, and use medium beads in three zones, with a thin zone 3 bead and a clean margin. Tap the cured overlay for the click before filing. When the client returns for removal, file down the bulk, soak in acetone warmed only in a warm-water bath, and push off softened product without prying.
Which acrylic bead is the usual working mix in standard nail-technology instruction?
A bead at a ratio that Pennsylvania Chapter 7 sets by regulation
A dry bead of equal parts, which flows smoothly toward the folds
A wet bead of about 2 to 1, which cures harder and much cooler
A medium bead of about 1.5 parts liquid to 1 part powder
In a three-bead acrylic application, where does the apex belong?
In zone 3, built thick against the cuticle
Only at the free edge, as thin as the plate allows
In zone 2, over the stress area near the smile line
On the sidewalls, so the edges carry the stress
A client wants acrylic removed quickly, and a coworker suggests heating the acetone in the break-room microwave. What is the safe practice?
Pry the softened edges up with nippers so the soak can be skipped
Warm the acetone container only in a bowl of warm water, away from flame
Microwave the acetone briefly, because warm acetone works faster
Heat the acetone on a candle warmer kept beside the manicure table
Sections you finish are checked off in the contents.