For Walker Tape Great White, lace adhesive cure time follows the water-based white-glue dry-clear cue: Great White dries clear to signal that it is tacky and ready to bond before lace mesh is pressed down. This beauty and hair guide pairs that wig glue turn clear dry time window with scalp oil prep and water based vs acrylic wig glue humidity behavior. For wash timing after sweat days, see hair care on a day you sweat and silk press humidity maintenance.
Water-based pressure-sensitive adhesives are formulated as emulsions of acrylic polymers in water stabilized by surfactants; when dried, particles coalesce and surfactant segregates to interparticle domains that provide pathways for water to enter the adhesive film.
When water-saturated, water-based acrylic PSA films can contain 10% or more moisture held in pores and surfactant and polymer domains, which plasticizes the adhesive film, reducing its cohesive strength and enhancing its flow properties.
Water-Based Acrylic Film Formation and the Clear/Tack Window
Normally, water-based acrylic PSA films are generated by coating the latex dispersion and removing the water via drying, which destabilizes the colloid and coalesces the polymer particles.
In waterborne acrylic latex films, Atomic Force Microscopy (AFM) images revealed that labile surfactants can migrate within the film during drying and form hydrophilic pathways or pockets, making the film more susceptible to water at higher surfactant concentrations.
During film formation of waterborne polymer clearcoats, surfactants can migrate toward interfaces to form hydrophilic pockets or pathways throughout the film, and these water-swollen pockets scatter light and make the film appear cloudy or white.
Under ASTM D2354-10(2018) Clause 3.1 (Standard Test Method for Minimum Film Formation Temperature (MFFT) of Emulsion Vehicles), satisfactory film integrity of emulsion coatings requires that as the aqueous phase evaporates the resinous portion of the vehicle coalesces into a continuous film.
Under Clauses 1.1 and 1.2 of the MFFT test method, the standard covers the determination of the minimum temperature at which emulsion vehicles (including latex vehicles) coalesce to form continuous films, and is limited to emulsions having minimum film formation temperatures below 90°C.
In monomer categorization for water-based acrylic PSAs by homopolymer glass transition temperature (Tg), soft monomers produce homopolymers with Tgs below about -30 ºC, hard monomers produce homopolymers with Tgs above 30 ºC, and medium monomers have Tgs between these values.
Table 1 lists n-Butyl Acrylate and 2-Ethylhexyl Acrylate as soft monomers and Methacrylic Acid and Acrylic Acid as functional monomers commonly used to synthesize water-based acrylic adhesives.
For glass transition temperatures (Tg) between -5 °C and 10 °C in acrylic latexes, the polymerizable surfactant PolySurf2 exhibits superior water whitening and water intake performances as compared to conventional surfactants.
Atomic force microscopy (AFM) images of a label-grade water-based acrylic PSA film under low (3%) and high (90%) relative humidity levels show a reversal in phase contrast demonstrating that surfactant domains readily sorb moisture at higher relative humidities.
Pressure-Sensitive Tack, Peel Metrology, and Premature Lace Press-Down
In practice, pressure-sensitive tack measurements gauge the force or energy necessary to separate two surfaces brought together at low pressure (e.g., < 0.1 Pa) for a short period of time, usually just a few seconds.
Under ASTM D2979-16 Clause 1.1 (Standard Test Method for Pressure-Sensitive Tack of Adhesives Using an Inverted Probe Machine), tack may be measured as the force required to separate an adhesive and the adherend at the interface shortly after contact under a defined load of known duration at a specified temperature.
Figure 2 shows both wet (1 minute of soaking in water at 22 °C) and dry (22 °C and 50% humidity) probe tack and tensile strength measurements for 24 commercial water-based acrylic PSAs.
In the probe tack tests, a 1 mm spherical probe was used on 25 μm PSA films backed by 50 μm PET film, loaded to 0.5N of force and held for 15 s before removing.
Water-based acrylic PSA films swell rapidly and saturate in a matter of a few seconds when exposed to water, reducing tack, adhesion, and strength, though much of the original tack is recovered when the PSA is dried.
Under ASTM D3330/D3330M-04(2018) Clauses 1.1.1 and 1.1.6 (Standard Test Method for Peel Adhesion of Pressure-Sensitive Tape), Test Method A gives a measure of adherence when peeled at 180° angle and Test Method F gives a measure of adherence when peeled at 90° angle to a standard steel panel or other surface of interest.
According to the Adhesive and Sealant Council (ASC), rough or uneven surfaces require PSA tapes with a thicker layer of soft, viscoelastic adhesives that flow into the smallest valleys of a surface given ample dwell time, whereas firm or very thin adhesives may not wet into the surface.
According to the Adhesive and Sealant Council (ASC), on a contoured surface, if a pressure-sensitive adhesive tape is too thin or firm, it can cause internal stress on the tape and/or minimize surface contact (resulting in tearing) and flagging (lifting at the edges).
According to the Adhesive and Sealant Council (ASC), higher substrate surface energy causes greater attraction and more adhesive wet-out, whereas lower surface energy reduces attraction and causes the PSA to wet out the substrate less; medium-surface-energy materials include PVC, Acrylic, Nylon, Polyester, and Polyurethane or epoxy paints.
According to Hairline Illusions (‘PRO Tips - Wig Glue - Wig Adhesives’), a patch test is performed by applying a small drop of glue on the inner forearm, allowing it to dry, removing it after about one hour, and watching for reactions over the next 24 hours; during lace application, thick layers can be clumpy and seep through laces and cause units to slip back.
Water-Based White Glue Versus Solvent Acrylic and Silicone Liquid Adhesives
Professional Hair Labs Ghost Bond Platinum is a water-based liquid adhesive formulated with Co-Polymer Dispersion and Propyl Paraben that stands up to oily scalps, heavy perspiration, and high humidity while providing 4-5 weeks of reliable hold time.
For Professional Hair Labs Ghost Bond Platinum, if bonding a skin/polyurethane unit, one thin coat is applied to the base first; then 4 thin coats are applied to the client’s scalp with the same quantity of adhesive per coat, allowing roughly 20 seconds between each coat to dry.
For Professional Hair Labs Ghost Bond Platinum, once the 4th coat is complete, wait 5 minutes for Ghost Bond Platinum to completely cure.
Because Professional Hair Labs Ghost Bond Platinum is water-based, the product will freeze and cannot be used anymore if exposed to freezing temperatures.
Professional Hair Labs Ghost Bond XL (1.3OZ) is a water-based adhesive for poly and lace systems formulated with extra moisture control targeting the 10% of clients who perspire the most.
Walker Tape Great White is a non-flammable, water-based, non-toxic sensitive-skin liquid adhesive that dries clear to signal that it is tacky and ready to bond, delivering a 2-4 Weeks (up to 4+ weeks maximum hold) waterproof bond.
According to Walker Tape Safety Data Sheet WTC-022 (Great White Aqueous Adhesive), Great White is a white liquid aqueous adhesive composed of Hydrophilic Acrylic Polymer Resins that is not considered hazardous by the OSHA Hazard Communication Standard (29 CFR 1910.1200).
Walker Tape Great White Pro is a low-odor, non-stringy, water-based white glue liquid adhesive for all hair system base types, upgraded to a maximum wear time of 4+ weeks compared to the 2-4 week hold time of original Great White.
Walker Tape Ultra Hold is a liquid adhesive with a distinct smell akin to nail polish remover that dries clear and delivers a maximum wear hold of 4+ weeks.
Directions for Walker Tape Ultra Hold (and Great White, Great White Pro, Extreme Hold, Mity-Tite, and Liqui-Tape) specify applying two thin layers of adhesive (making sure the first is dry before applying the second), blow-drying or letting sit until very tacky, pressing firmly for 10 seconds, and not swimming, working out, or shampooing for at least 24 hours.
Walker Tape Ultra Hold Adhesive contains Ethyl acetate (10-30 Weight-%), Isopropanol (10-30 Weight-%), Heptane, branched, cyclic and linear (10-30 Weight-%), Toluene (1-5 Weight-%), Vinyl acetate (0.1-1 Weight-%), and Tert-pentyl peroxypivalate (0.1-1 Weight-%).
Walker Tape Ultra Hold Adhesive has an initial boiling point of 60 °C / 140 °F, a Seta Closed Cup flash point of < -6.6 °C / < 20 °F, a relative density of 0.85, is Insoluble in water, and has a calculated VOC Content of 50.86%.
Walker Tape Extreme Hold is a silicone-based maximum-wear (4+ weeks) liquid adhesive that starts and dries clear and has a high resistance to heat, humidity, and moisture.
Walker Tape Extreme Hold contains 30-40 Weight-% Ethylacetate (CAS 141-78-6), has an initial boiling point > 77 °C / 171 °F, a closed-cup flash point of -4.44 °C / 24 °F, and a relative density of 1.02.
Walker Tape Mity-Tite and Liqui-Tape are daily-wear liquid adhesives offering a 1-7 days hold time for quick touch-ups and hairline adjustments; with proper storage in a cool, dark, dry room-temperature environment (60-80°F), all Walker Tape liquid adhesives have a shelf life of up to 6 months.
Scalp Sweat, Sebum, Oil Prep, and Bond Slip
Humans have ~2–4 million eccrine sweat glands in total; the highest gland densities are on the palms and soles (~250–550 glands/cm2), while eccrine gland density on non-glabrous skin such as the face, trunk, and limbs is ~2–5-fold lower than on glabrous skin.
Apocrine sweat glands are located primarily in the axilla, breasts, face, scalp, and the perineum, open into hair follicles instead of onto the skin surface, and produce viscous, lipid-rich sweat comprised of proteins, sugars, and ammonia.
Sebaceous glands are holocrine glands that secrete a viscous, lipid-rich fluid (sebum) consisting of triglycerides, wax esters, squalene, cholesterol, and cholesterol esters.
In human eccrine sweat, Sodium concentration is 10–90 mmol/L and Chloride concentration is 10–90 mmol/L, with concentrations varying up to 2–3 fold with sweating rate.
In human eccrine sweat, Potassium concentration is 2–8 mmol/L and Calcium concentration is 0.2–2.0 mmol/L.
In human eccrine sweat, Lactate concentration is 5–40 mmol/L and Urea concentration is 4–12 mmol/L.
In human eccrine sweat, Ammonia concentration is 1–8 mmol/L and Bicarbonate concentration is 0.5–5.0 mmol/L; reabsorption of HCO3 and H+ secretion in the sweat duct results in acidification of final sweat, with final sweat pH lower (more acidic) at lower sweating rate.
The American Academy of Dermatology states that if you have straight hair and an oily scalp you may want to shampoo every day, whereas dry, textured, curly, or thick hair should be shampooed when needed, at least once every 2 to 3 weeks, applying shampoo to the scalp to wash away built-up products, dead skin, and excess oil.
The American Academy of Dermatology (‘Black hair: Tips for everyday care’) recommends washing Black hair once a week or every other week to prevent build-up of hair care products, and ensuring that braids, cornrows, or weaves are not too tight because pain equals damage.
The American Academy of Dermatology advises wearing a professional weave or hair extension for 2 or 3 months at most and keeping up scalp hygiene when wearing a weave or hair extension.
Walker Tape 99% Alcohol leaves no residue, removes oil, dirt, and residue from skin before scalp protector and adhesive application, and evaporates in a few seconds when applied in a thin layer across the scalp.
In Walker Tape Isopropyl Alcohol (CAS 67-63-0, Weight-% >99), the melting/freezing point is -88 °C / -128 °F, initial boiling point is 82 °C / 180 °F, Tag Closed Cup flash point is 11 °C / 53 °F, evaporation rate is 2.3 (N-butyl acetate = 1), vapor pressure is 36 mmHg at 20°C/68°F, and relative density is 0.79 at 25°C (77°F).
Walker Tape Max Hold Sport is a hypoallergenic scalp protector that protects against humidity, sweat, oils, and water activities; directions specify preparing skin with 99% Alcohol, applying 1-2 coats of Max Hold Sport before any adhesive, and letting it dry completely, which provides immediate adhesion with no need to wait 24 hours after install before getting the unit wet.
Walker Tape Max Hold Sport contains 45-70 Weight-% Isopropyl Alcohol (CAS 67-63-0) and 0.1-1 Weight-% Toluene (CAS 108-88-3), with flash point 11 °C / 53 °F, evaporation rate 1.4, vapor pressure 32 mmHg at 20°C/68°F, relative vapor density 2.1 (air = 1), and relative density 0.789 at 25°C (77°F).
For Walker Tape Scalp Protector, directions specify preparing the scalp with 99% Alcohol, applying one coat thinly on the scalp, and letting it dry until not tacky to touch before applying adhesive or tape.
Walker Tape Scalp Protector (SDS WTC-005) contains 80-100 Weight-% Isopropyl Alcohol (CAS 67-63-0) and <0.1 Weight-% Toluene (CAS 108-88-3).
Removal Solvents and Post-Removal Scalp Reset
Walker Tape C-22 Solvent is an oil-based, citrus-scented adhesive remover with a 1 year shelf life; because it is oil-based, C-22 Remover leaves behind residue that can be cleaned with soap and water.
Walker Tape C-22 Adhesive Remover contains 5-10 Weight-% Aloe barbadensis leaf juice (CAS 85507-69-3), should not be stored above 120°F, and has a flash point of 66°C / 150.8°F, evaporation rate < 0.06 (n-BuAc =1), vapor pressure 0.2 mm Hg at 20°C/68°F, relative density 0.822, and liquid density 6.86 lbs/U.S. gallon.
Walker Tape Action Adhesive Remover is a fast-acting, citrus-fragrance solvent remover that leaves behind less oily residue than C-22; for a solvent soak of a hair system, soak times vary from 5-30 minutes depending on the type of system and adhesive used, followed by shampooing and rinsing.
Walker Tape S3 Sensitive Skin Solvent is a hypoallergenic, gentle, oil-based citrus adhesive remover with medium removal speed and high residue that is cleaned up with soap and water.
Walker Tape Bond Breaker Shampoo is used after hair system removal and before the next install to break down adhesive residue, exfoliate the scalp, and improve hold times.
Verifiable Lace Adhesive Install Checklist
| Check Dimension | Parameter to Verify | Documented Target or Threshold |
|---|---|---|
| Ghost Bond Platinum inter-coat dry | Seconds between thin coats on scalp | Roughly 20 seconds between each of 4 thin coats |
| Ghost Bond Platinum final cure | Wait after 4th coat before attachment | Wait 5 minutes for complete cure |
| Ghost Bond Platinum hold window | Rated wear on oily scalp / humidity | 4-5 weeks of reliable hold time |
| Walker Tape white-glue clear signal | Optical dry cue before press-down | Dries clear to signal tacky and ready to bond; Great White 2-4 Weeks (up to 4+ weeks maximum) |
| Walker Tape two-layer liquid adhesives | Layer count, press, activity hold-off | Two thin layers; press firmly for 10 seconds; no swimming, workout, or shampoo for at least 24 hours |
| Ghost Bond XL moisture targeting | Perspiration cohort called out | Extra moisture control targeting the 10% of clients who perspire the most |
| Ultra Hold solvent acrylic flash point | Closed-cup flash and VOC | Flash point < -6.6 °C / < 20 °F; VOC Content 50.86%; insoluble in water |
| Extreme Hold silicone max wear | Hold and flash point | 4+ weeks; flash point -4.44 °C / 24 °F |
| Daily-wear liquids shelf life | Storage and shelf window | 1-7 days hold; store 60-80°F; shelf life up to 6 months |
| Scalp alcohol prep | Oil and residue clear | 99% Alcohol evaporates in a few seconds in a thin layer |
| Max Hold Sport barrier | Coats before adhesive | 1-2 coats after 99% Alcohol; dry completely; no need to wait 24 hours before getting the unit wet |
| Remover soak window | Action remover soak | Soak times vary from 5-30 minutes depending on system and adhesive |
Sources
- USDA Forest Products Laboratory (Houtman et al. 2007) — Properties of Water-Based Acrylic Pressure Sensitive Adhesive Films in Aqueous Environments
- American Coatings Association / Syensqo — Water Resistance Properties of Acrylic Polymer Films Using Polymerizable Surfactants
- ASTM International — ASTM D2354-10(2018) Minimum Film Formation Temperature (MFFT) of Emulsion Vehicles
- ASTM International — ASTM D2979-16 Pressure-Sensitive Tack of Adhesives Using an Inverted Probe Machine
- ASTM International — ASTM D3330/D3330M-04(2018) Peel Adhesion of Pressure-Sensitive Tape
- Adhesive and Sealant Council (ASC) — Pressure Sensitive Adhesive (PSA) Tape Selection Considerations
- Temperature / NIH PubMed Central — Physiology of Sweat Gland Function
- American Academy of Dermatology (AAD) — Tips for Healthy Hair
- American Academy of Dermatology (AAD) — Black Hair: Tips for Everyday Care
- American Academy of Dermatology (AAD) — Hair Care Habits That Can Damage Your Hair
- Professional Hair Labs / SuperHairPieces listing — Ghost Bond Platinum
- Professional Hair Labs / SuperHairPieces listing — Ghost Bond XL
- Hairline Illusions — PRO Tips - Wig Glue - Wig Adhesives
- Walker Tape Co. — Great White, Great White Pro, Ultra Hold, Extreme Hold, Mity-Tite, Liqui-Tape
- Walker Tape Co. — 99% Alcohol, Max Hold Sport, Scalp Protector
- Walker Tape Co. — C-22 Solvent, Action Adhesive Remover, S3 Sensitive Skin Solvent, Bond Breaker Shampoo
- Walker Tape Co. — SDS WTC-001 Ultra Hold, SDS WTC-022 Great White, SDS WTC-030 Extreme Hold, SDS WTC-005 Scalp Protector
