The GelBottle Inc introduces Hard BIAB™ to aid nail length & durability

The GelBottle Inc, the nail brand behind the popular BIAB™ (Builder In A Bottle^™) enhancement product, has launched an evolution of the builder gel: one that is engineered to meet client demands for durability, length and smooth application.

Hard BIAB™ is a hybrid formula that combines the strength of hard gel with the slick application of the original BIAB™.

The formula is useful when creating overlays and long extensions. Results from an October 2025 trial – in which 30 professional nail technicians tested Hard BIAB™ – revealed that 100% of users said it was ‘suitable for repairing split or chipped nails’.

“I’m incredibly proud to launch Hard BIAB™, a true evolution of our original innovation,” says Daisy Kalnina, CEO & founder of The GelBottle Inc.

“It’s a testament to our commitment to pushing boundaries and empowering nail techs with the tools they need to thrive.”

The key features of the product evolution include:

Strength for length

Hard BIAB™ is designed for clients seeking to maintain or extend their nail length. The formula creates ‘a rigid, ultra-durable overlay that resists bending and stress, providing the necessary support for medium to long nail extensions’.

Built-in base for improved retention

The product is a file-off system, and can be paired with TGB Base Coats for easier removals.

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Hybrid formula

Combining the strength of hard gel and the self-levelling properties of BIAB™, Hard BIAB™ allows technicians ‘to achieve the perfect apex and structure with maximum precisions and minimal filing’.

Effortless application

The product is user-friendly and offers reduced application time due to being packaged in the popular BIAB™ bottle with a brush applicator.

Maximum versatility

Hard BIAB™ can be used for practices including overlays, sculpting extensions and performing nail repairs that require ‘superior structural integrity’.