If you're thinking about offering nail services, or you're already a technician deciding what to learn next, you've almost certainly come across the BIAB vs gel debate. Both are huge in Irish salons right now and both are in high demand. But they're very different products that serve different purposes.

Here's a straight breakdown of what sets them apart, who each one is right for, and which you should learn first.

What are gel nails?

"Gel nails" is a broad term that covers several products. The two most common in Irish salons are:

Gel polish. A thin, flexible, coloured gel applied in layers over the natural nail and cured under a UV or LED lamp. It looks like regular nail polish but lasts 2–3 weeks without chipping. Removal involves soaking in acetone.

Hard gel / gel extensions. A thicker, stronger gel used to build length and structure, sculpted over a form or applied over a tip. It can't be soaked off and must be filed down. It takes significantly more skill and practice to master.

When most people say "gel nails" in everyday conversation, they mean gel polish. When a nail tech says it, they might mean either.

What is BIAB?

BIAB stands for Builder In A Bottle. It's a medium-to-high viscosity soak-off builder gel that comes in a brush bottle, hence the name. It was popularised by The Gel Bottle Inc., but the technique is now available across many product lines.

BIAB sits between gel polish and hard gel in thickness and durability. It's applied over the natural nail to:

  • Strengthen and reinforce thin or damaged nails
  • Create a structured apex (the highest point of the nail) for longer wear
  • Add a small amount of length if needed
  • Provide a base for gel polish colour on top

The result lasts significantly longer than gel polish, causes less damage to the natural nail than acrylics, and can be maintained with infills rather than full removal every visit.

BIAB vs gel polish: the key differences


 BIAB Gel polish
Thickness Medium-thick, builds structure Thin, colour only
Durability 4–5+ weeks 2–3 weeks
Maintenance Infills every 3–4 weeks Full soak-off and reapplication
Nail health Strengthens natural nails Neutral, no structural benefit
Removal Soak-off with acetone Soak-off with acetone
Learning curve Moderate, needs practice Low, beginner friendly
Price in Ireland €50–€80 per application €30–€55 per application
Client return Very high, infills every 3–4 weeks High, reapplication every 2–3 weeks

Which is better for nail health?

BIAB wins here. Because it creates a protective layer over the natural nail, clients with thin, peeling or brittle nails often find BIAB transforms the health of their nails over time.

Gel polish is neutral. It doesn't damage nails if applied and removed correctly, but it doesn't strengthen them either. Damage from gel polish usually comes from poor prep, over-filing, or picking and peeling during removal, rather than the product itself.

Which is better for your business?

Both are excellent services to offer, for different reasons.

Gel polish is the lower-barrier entry point. It's faster to learn, needs less equipment, and is a great starting service with high volume: quick appointments and regular returns.

BIAB commands a premium price, builds very loyal clients and generates regular infill bookings. Once a client switches to BIAB they rarely go back, and it's driving the most word-of-mouth referrals in Irish salons right now.

Why BIAB is Ireland's most in-demand nail treatment

  • Irish clients want results that last, and BIAB delivers that more consistently than gel polish
  • Social media has driven huge awareness of the "Builder in a Bottle" look on TikTok and Instagram
  • Nail technicians who offer BIAB are consistently booked weeks in advance
  • The infill model creates recurring revenue, with clients returning every 3–4 weeks

Should you learn gel polish or BIAB first?

The honest answer: learn both, and start with gel polish if you're a complete beginner.

Gel polish teaches you the fundamentals of prep, application, curing and removal. Everything else builds on these. Once you're confident with gel polish, BIAB is the natural next step and immediately lifts your earning potential.

If you already have some nail experience, go straight to BIAB. That's where the demand is.

The Build A Beautiful Nail Bundle covers both Gel Polish and BIAB, plus the Beauty Business Starter Kit, for €150. It's designed for exactly this progression. Pay in 3 with Klarna at checkout.

How to learn BIAB online in Ireland

The BIAB Online Course covers nail anatomy, prep, full BIAB application, apex building, infills and removal across 96 video lessons, with lifetime access. It's beginner friendly and accredited by AIT (Associated Irish Therapists) and ABT (Associated Beauty Therapists). Once you complete the course and pass your case studies, you can apply for professional insurance. Requirements vary between insurers, so confirm with your chosen provider before you start treating clients.

Already know BIAB and want to add gel polish? The Gel Polish Online Course is the perfect companion.

New to nails altogether? Start with our guide on how to become a nail technician in Ireland.