LONDONTOWN Nail Hardener & Base Coat — Biotin-Infused 2‑in‑1 Strengthening Treatment, 0.40 fl oz

LONDONTOWN Nail Hardener & Base Coat is a dual-action biotin-infused treatment that strengthens fragile nails while priming them for longer-lasting polish.

If your nails chip, split, or feel thin, this 2-in-1 formula combines a nail-strengthening system with a reliable base coat so you can build healthier-looking nails without an extra step. Infused with Biotin and the brand’s Florium Complex, it reinforces the nail plate, adds a protective nitrocellulose shield, and creates a gripping surface to improve polish wear. The lightweight finish keeps nails smooth and ready for color while addressing breakage over time.

How does this product strengthen weak or brittle nails?

The formula delivers fortifying ingredients directly to the nail plate to improve resilience and reduce splitting. Biotin supports keratin structure, while antioxidants and vitamins in the Florium Complex help maintain nail integrity. Nitrocellulose forms a protective layer that resists everyday stress and prevents immediate chipping.

• Biotin-infused treatment targets the nail’s protein matrix for added firmness.
• Florium Complex supplies antioxidants and vitamins for balanced nourishment.
• Nitrocellulose creates a tough, flexible top shield to limit breaks and chips.

Will it work as a base coat under colored polish?

Yes — the product is formulated to act both as a strengthening treatment and as a dependable base coat. It provides a smooth, adherent surface that helps color apply evenly and last longer. The finish minimizes visible ridges so colored polish glides on and maintains shine.

• Primes nails for even pigment distribution and improved adhesion.
• Reduces polish lifting and premature chipping for extended wear.
• Lightweight formula avoids thick buildup under color finishes.

How quickly can I expect to see stronger nails?

Results vary by nail condition and usage frequency, but many users notice reduced chipping and smoother surfaces within a few weeks of regular use. Daily or every-other-day application supports incremental improvement as the nail grows out. Continued use helps maintain strength and decreases the chance of recurrent breakage.

• Visible surface improvement often within a few weeks with consistent application.
• Ongoing use required to protect new growth and sustain resilience.
• Works alongside regular manicures to extend the life of nail color and health.

How should I apply it for best results?

Apply one thin, even coat to clean, dry nails and allow it to dry fully before applying polish. Use as a standalone strengthening coat between manicures or as the first layer under your color. Reapply every few days or whenever you notice wear to continue protection and support growth.

• Start with clean, oil-free nails for maximum adhesion.
• Apply thin coats to avoid thickness while ensuring coverage.
• Use under polish or alone as a treatment; reapply as needed for maintenance.

Who is this for: LONDONTOWN Nail Hardener & Base Coat is designed for people with weak, brittle, or splitting nails who want to strengthen their natural nails while still wearing polish. It suits those who prefer a multitasking product that saves time — offering both a fortifying treatment and a reliable base coat — and for anyone looking to protect manicure longevity without heavy build-up. Ideal for at-home nail care or as part of a professional regimen, it supports healthier nail appearance and improved polish performance.

Ingredients

Ethyl Acetate, Butyl Acetate, Alcohol Denat., Nitrocellulose, Adipic Acid/Neopentyl Glycol/Trimellitic Anhydride Copolymer, Isopropyl Alcohol, Trimethyl Pentanyl Diisobutyrate, Acetyl Tributyl Citrate, Sucrose Acetate Isobutyrate, Etocrylene, Brassica Campestris (Rapeseed) Seed Oil, Allium Sativum (Garlic) Bulb Extract, Biotin, Calcium Pantothenate, Oenothera Biennis (Evening Primrose) Flower Extract, Chamomilla Recutita (Chamomile) Flower Extract, Cucumis Sativus (Cucumber) Fruit Extract, Water, Dimethicone, Retinyl Palmitate (Vitamin A), Tocopheryl (Vitamin E) Acetate, Carthamus Tinctorius (Safflower) Seed Oil, CI 60725