Why Does PU Coating Fail to Stick to Tape Surfaces?

Written by

Megan Brooks

Last modified April 2, 2025

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When it comes to hair replacement systems, durability is everything. Yet, wearers repeatedly complain about the PU (polyurethane) coating refusing to bond properly with tape.

We remember a conversation we had with one of our clients, David, whose hair system kept lifting no matter how often it was re-taped. It turned out that the PU coating on the base was rejecting the adhesive altogether. The problem wasn’t the tape. It was the coating itself!

PU is smooth. Adhesive tapes, especially those used in hair systems, rely on surface texture to grip. Ever tried sticking sellotape to glass? It holds, but barely.

But why does this happen? Let us understand!

Key Takeaways

PU coating stands for Polyurethane, a thin, flexible layer applied to the base of a hair system.
Tape surfaces in hair systems are double-sided tapes used for securely attaching the hair system to the scalp.
PU coating fails to stick to tape surfaces due to residue, low temperatures affecting adhesive activation, or poor tape quality.
For PU-coated hair systems to adhere properly to adhesive tapes, the surface must be clean, dry, and free from residue.

What is PU Coating?

PU coating, which stands for Polyurethane, is a thin, flexible layer applied to the base of a hair system. It creates a smooth, skin-like surface that replicates the scalp, making the hair system more durable and easier to attach.

PU coating serves multiple purposes. Depending on the hair system’s design, it is mainly applied around the perimeter (also called the periphery) or across the entire base. This coating strengthens the support, making using and removing adhesive tapes easier. It also offers a stronger hold and better durability.

One of the considerable points of PU coating is its natural-looking finish. The transparent layer mixes well with the scalp, making the hair system appear more realistic. Additionally, PU coating helps prevent shedding by sealing the knots where the hair strands are tied, reducing the risk of hair loss from the system.

PU-coated bases are also easy to clean and maintain, making them popular for people who frequently wear hair systems.

What are Tape Surfaces in Hair Systems?

Hair systems typically consist of a base material made from lace, monofilament, or polyurethane (PU). However, not all base materials are suitable for direct tape application.

Many men’s and women’s hair systems come with tape surfaces with specific zones supported with PU coating.

PU coating is commonly used because of its smoothness, making it ideal for tape adhesion.

The placement of tape surfaces changes depending on the style and coverage of the hair system.

For instance:

Perimeter Tape Surface: Many hair systems have a PU-coated perimeter, making applying tape along the edges easier. This structure offers a secure fit and is commonly used in men’s hair systems designed for full or partial coverage.

Full-Base Tape Surface: Some women’s hair systems, particularly full-cap hair systems or partial hair pieces, may have a larger tape surface covering the entire base. This provides extra security and is ideal for individuals aiming for a stronger, long-term hold.
Custom Tape Sections: In specific systems, tape surfaces are strategically placed at stress points (like the temple or crown) to improve grip and prevent lifting, especially in heavier-density hair systems.

Something you need to know – Polyurethane or silicone are used for tape surfaces in hair systems, as these materials prevent slippage and offer reliable adhesion.

However, using tape directly on delicate lace bases without a tape surface can damage the lace and reduce the system’s longevity. That’s why many hair systems incorporate PU-coated areas specifically for tape application.

Reasons Why PU Coating Fails to Stick to Tape

Here are the most common reasons why PU coating may fail to stick to tape:

1) Oil and Residue Buildup

One of the first reasons for poor adhesion is oil, sweat, or product residue on the PU-coated surface. Natural scalp oils, leftover adhesive residue, or styling products can create a thin barrier between the PU coating and the tape, preventing a strong bond.

Solution:

2) Low-Quality Tape

Not all tapes are designed to bond effectively with PU surfaces. Using low-quality tapes may lead to weak adhesion. Some tapes are formulated for lace bases or skin bases, which may not work well with PU coating.

Solution:

3) Improper Application Technique

Incorrect application methods can reduce the bond’s effectiveness. When applying tape over PU-coated areas, air bubbles might lead to poor contact and weak adhesion. Taping onto a moisture or sweaty surface also reduces the bond strength.

Solution:

4) PU Coating Deterioration

Over time, PU coating can degrade and become less sticky. This is especially common in older hair systems or those exposed to frequent washing, heat, or chemical treatments. A worn-out PU coating becomes less adaptive to adhesive tapes.

Solution:

5) Environmental Conditions (Heat and Humidity)

High humidity or heat can weaken the adhesive bond between the tape and PU coating. Moisture creates a slippery layer, reducing the tape’s ability to grip the surface. Heat can also cause the PU coating to soften or become slightly tacky, making it harder for the tape to hold.

Solution:

6) Low-quality or Damaged PU Coating

Some hair systems are insufficient for PU coatings with poor texture or finish, making them less adhesive-friendly.

Additionally, if the coating is uneven, it creates weak spots for tape adhesion.

Solution:

7) Chemical Interference

Certain hair products, such as alcohol-based sprays, oils, or serums, can weaken the bond between the PU coating and the tape. These products create a slippery barrier, reducing the adhesive’s grip.

Solution:

Tips to Ensure Strong Tape Adhesion on PU Coating

1) Clean It Right

2) Pick the Right Tape

3) Roughen the Surface

4) Make It Stick Properly ( Very Properly )

5) Avoid Overstretching the Tape

6) Allow the Bond to Settle

FAQ’s

What is PU coating in the hair system?

PU stands for polyurethane and is the transparent & flexible material used as the base of the hair system.

Why is my PU-coated hair system not sticking to the tape properly?

Many factors can affect your PU-coated hair system if it does not stick properly, such as improper scalp and hair system base preparation, incorrect tape type, or insufficient pressure during application.

What type of tape works best with PU-coated hair systems?

Many are available on the market, but Walker Tape works best with PU-coated hair systems.

How do I clean the PU surface before applying tape?

Clean it with a 50/50 mixture of alcohol and water.

Can heat or humidity affect tape adhesion on PU coating?

Yes, heat or humidity can affect tape adhesion on PU coating.

Should I use a scalp protector or adhesion booster for a better tape grip?

Yes, you can use a scalp protector or adhesion booster for a better tape grip.

Conclusion

We have spent years perfecting our PU coating and tape techniques, so you never have to worry about lifts, slips or adhesion issues.

This expertise allows us to provide high-quality hair systems that stay secure, comfortable, and long-lasting. Choose confidence, choose Oxéa London!

Author Profile

Megan Brooks

Megan Brooks is a Certified Trichologist at Oxea Invisible Hair Solutions with over 21 years of Unbeatable experience. Throughout her remarkable career, she has successfully completed an impressive 8000+ hair replacement systems. Megan is dedicated to transforming lives and boosting self-confidence so that one can live with all the pride. She has served over 800 satisfied clients and still-counting, while helping them regain their natural appearance and feel their best.