BESTSELLER
A clear bottle of LONDONTOWN Nail Hardener & Base Coat, promising stronger nails with its unique formula, is showcased with a sleek black cap on a white background.
Nail Hardener & Base Coat
Nail Hardener & Base Coat
Nail Hardener & Base Coat
Nail Hardener & Base Coat
Nail Hardener & Base Coat
Nail Hardener & Base Coat
Nail Hardener & Base Coat
Nail Hardener & Base Coat
Nail Hardener & Base Coat
A clear bottle of LONDONTOWN Nail Hardener & Base Coat, promising stronger nails with its unique formula, is showcased with a sleek black cap on a white background.
Nail Hardener & Base Coat
Nail Hardener & Base Coat
Nail Hardener & Base Coat
Nail Hardener & Base Coat
Nail Hardener & Base Coat
Nail Hardener & Base Coat
Nail Hardener & Base Coat
Nail Hardener & Base Coat
Nail Hardener & Base Coat
4.8
Rated 4.8 out of 5 stars
455

Nail Hardener & Base Coat

2-in-1 strengthener & base coat

  • In stock, ready to ship
  • Inventory on the way
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Our trusted multitasker. This is a dual-action base coat that fortifies and primes, powered by Biotin, antioxidants, and essential vitamins to help strengthen weak or damaged nails. An infusion of our proprietary Florium Complex further nourishes, creating an ideal base that better grips onto polish. Wear it alone as a daily treatment to shield and replenish, or discover how it transforms into a durable base that boosts your mani-pedi’s wear-time with less chipping and breakage.


  • Creates a resilient shield that helps strengthen weak, brittle, or damaged nails
  • Primes nails to better grip onto polish—and help it last
  • Improves mani-pedi longevity by gripping onto polish to prevent chipping and breakage
  • Encourages healthier, stronger-looking nails with a blend of Biotin, vitamins, and botanical ingredients perfectly calibrated to help fortify and nourish with every wear
  • Can be worn alone as a daily treatment that gives nails a natural, healthy-looking finish

12 ml / .4 fl oz

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All Nail Types

KEY INGREDIENTS

  • Biotin (Vitamin B Complex) helps restore strength and improve flexibility to prevent splitting, breakage, and brittleness
  • Florium Complex deeply replenishes, visibly repairs, and encourages healthy regrowth
  • Nitrocellulose forms a protective shield and creates a semi-occlusive yet breathable barrier to shield nails from further damage & depletion
  • Safflower Oil moisturizes and helps restore dry, brittle, or damaged nails 

INGREDIENTS

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

CLEAN BENEFITS

  • 21+ Free
  • Breathable
  • Certified Vegan
  • Cruelty Free
  • Gluten Free
  • Paraben Free
  • Phthalate Free

Apply a thin and even layer over clean, bare nails. Follow with 1-2 coats of lakur and seal in with your favorite kur top coat. (If you want to maximize strength-boosting properties, finish with Protective Top Coat.)

For best results, wipe down each nail with Strengthening Lacquer Remover or use Pre-Prep Nail Dehydrator before applying your base coat.

Nail Hardener & Base Coat
4.8
Rated 4.8 out of 5 stars
Based on 455 reviews
Total 5 star reviews: 413 Total 4 star reviews: 22 Total 3 star reviews: 10 Total 2 star reviews: 6 Total 1 star reviews: 4
96%would recommend this product
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455 reviews
  • H
    Heidi
    Verified Buyer
    I recommend this product
    Pros Exceeds Expectations, Conditions, Would Purchase Again
    Rated 5 out of 5 stars
    7 months ago
    Hangs on to your manicure

    Really holds my manicure in place. I use my hands a lot and wash them constantly and my manicure still lasted a week before I took the polish off myself. It didn't even chip at all

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    LONDONTOWN
    7 months ago

    Thank you so much for your wonderful 5-star review, Heidi! We're thrilled to hear about your amazing experience with our Nail Hardener & Base Coat. It's fantastic that you've achieved such impressive durability - lasting a full week without chipping even with constant hand washing and heavy use is exactly the kind of performance we strive for!

    Thank you for sharing your experience! We're glad to hear the base coat helps your polish last longer and grips well – this was a key feature we focused on when creating the formula.

    Your thoughtful feedback helps other customers understand the exceptional staying power that makes our Nail Hardener & Base Coat such a special product in our collection. It helps other customers appreciate the long-lasting power of our Nail Hardener & Base Coat.

  • K
    Kayla
    I recommend this product
    Pros Conditions, Performs as Described, Exceeds Expectations, Would Purchase Again
    Rated 5 out of 5 stars
    1 year ago
    Kayla

    I’ve been using this base coat/nail hardener for one month straight and I can’t believe how much it’s transformed nails. They’re noticeably stronger; I could never grow my nails out without at least one breaking! This is a MUST HAVE for all you DIY ladies that give yourself manicures. I always wear polish with a glossy top coat for protection.

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  • MR
    Mary R.
    Verified Buyer
    I recommend this product
    Pros Smells Great, Exceeds Expectations, Gentle, Conditions, Would Purchase Again
    Rated 5 out of 5 stars
    1 year ago
    Awesome products!

    London town has proven the point. I’ve now gotten rid of all my other nail polish topcoats space coats, and just strictly use London town. They are fantastic. From their price point to the product safety ingredients to actually working. Oh my gosh what more can you want?

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  • LM
    Liliana M.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    1 year ago
    Survived the cruise life …

    Great base. Keeps my nails polish on without chipping for about a week! The pic is 5 days and going strong.

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  • EY
    Emme Y.
    Verified Reviewer
    I recommend this product
    Pros Gentle, Conditions, Performs as Described, Exceeds Expectations, Would Purchase Again
    Rated 5 out of 5 stars
    1 year ago
    Works great

    Been using it for a week and it's keeping my nails from breaking and lifting. Also dries really quickly.

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Frequently Asked Questions

What makes Londontown’s Nail Hardener & Base Coat different from regular base coats?
Unlike standard base coats, this multitasking formula doubles as both a nail strengthener and a primer. It’s enriched with Biotin, antioxidants, essential vitamins, and our proprietary Florium Complex to help fortify weak or damaged nails while creating a smooth, adherent surface that helps polish last longer.
Is Nail Hardener & Base Coat safe for all nail types, including brittle or damaged nails?
Yes. This formula is designed to protect and support nails at every stage, especially brittle, thin, or damaged nails. It creates a resilient shield that helps minimize breakage, while nourishing ingredients encourage healthier, stronger-looking nails over time.
How do I use Nail Hardener & Base Coat for best results?
Apply one coat to clean, bare nails before polish to prime and strengthen. It can also be worn alone as a daily treatment for a natural, healthy-looking finish. For maximum benefits, use consistently to help shield and replenish nails with every wear.
How long does Nail Hardener & Base Coat last, and how often should I reapply?
When used as a base coat, it extends mani-pedi longevity by helping polish adhere better and resist chipping or peeling.
Is Nail Hardener & Base Coat vegan and cruelty-free?
Absolutely. This formula is 100% vegan, cruelty-free.
Will Nail Hardener & Base Coat actually help strengthen my nails?
This formula is specifically designed to support weak or brittle nails. Biotin and essential vitamins help fortify nail structure, while Florium Complex nourishes.