Extreme Seal Advanced Limestone Sealer 5.0 kg

Manufactured by Trade Supplies UK

Extreme Seal Advanced Limestone Sealer is a premium impregnating sealer engineered to provide long-lasting protection and satin enhancement for Indian sandstone, natural limestone, granite, slate, and other porous stones. Designed with a high-performance hybrid resin system, this professional-grade coating penetrates deep into the substrate to block moisture, stains, and algae while maintaining the surface's natural beauty.

Manufactured in the UK under ISO 9001 quality standards, this advanced limestone sealer forms a durable, breathable barrier that guards against UV rays, oil stains, mould, and frost damage. It not only enriches the colour of patios and paving but also strengthens the surface against erosion and weed growth, extending the lifespan of outdoor installations for up to five years.

Key Benefits

Long-Lasting Protection

Formulated with high-solids resins, this limestone sealer penetrates deeply to protect against water, oil, salts, and stains. It resists the freeze-thaw cycle and reduces surface degradation, making it ideal for the British climate.

Premium Satin Finish

The satin finish enhances the stone’s natural tone without creating a glossy or artificial appearance. It delivers a subtle sheen, highlighting texture and colour variation, giving patios, courtyards, and driveways a refined look.

Advanced Impregnating Formula

Unlike traditional surface coatings, this impregnating formula absorbs into the stone to create an invisible barrier that repels contaminants while allowing trapped moisture to escape. This ensures long-term durability without blistering or peeling.

Stain and Algae Resistance

Built-in biocidal and hydrophobic properties prevent algae, mould, and moss buildup. It also resists oil and grease penetration, making cleaning and maintenance effortless throughout the year.

Weather and UV Resistant

UV-stable polymers protect the stone colour from fading and chalking caused by sunlight exposure. The coating withstands regular washing and resists degradation from harsh weather conditions.

Easy, Fast Application

With its quick-drying technology, Extreme Seal Limestone Sealer can be recoated within hours. It applies smoothly using a brush, roller, or sprayer, reducing project time and enabling same-day completion.

Suitable Surfaces

This product is compatible with most interior and exterior natural stone and mineral surfaces, including:

Indian sandstone and limestone patios
Granite, slate, and concrete paving
Driveways, courtyards, and garden paths
Stone cladding, walls, and terraces

⚠️ Not suitable for areas grouted with resin-based or Easy Grout systems, or surfaces previously sealed with silicone or stearate-based repellents.

Performance and Coverage

First Coat: Approx. 5 m² per litre
Second Coat: Approx. 7 m² per litre
Typical Lifespan: Up to 5 years (depending on exposure and maintenance)
Finish: Satin, breathable impregnating barrier

These figures are approximate and depend on substrate porosity and condition. Apply in thin, even coats for a consistent finish and to prevent whitening or unevenness.

Drying and Curing Times (@ 18 °C)

Touch Dry: 2–4 hours
Recoat: After 4–6 hours
Foot Traffic: 12 hours
Vehicle Traffic: 24 hours
Complete Chemical Cure: 7 days

To maintain clarity and performance, do not allow rain or surface moisture during and for at least six hours after application.

Durability and Maintenance

Once cured, Extreme Seal Advanced Limestone Sealer provides up to five years of active protection. The sealed surface remains breathable and easy to clean, so simply wash it with water or a pH-neutral detergent. To renew repellency, reapply a single maintenance coat when water no longer touches the surface.

Storage and Handling

Storage Temperature: 5–30 °C, frost-free and away from ignition sources
Clean-Up: Warm, soapy water (no thinners required)
Container Sizes: 5L, 10L, and 20L tins
Safety: Keep children out of reach. Avoid contact with the eyes and prolonged skin exposure.

During peak demand, products may be supplied in plain white tins with official labelling. Performance and quality remain identical.

Where to Use

Extreme Seal Advanced Limestone Sealer is ideal for natural stone surfaces that require long-term protection and colour enhancement while maintaining breathability and natural appearance. It’s trusted by professionals and homeowners alike for domestic and commercial use.

Patios and Driveways: This product protects Indian sandstone, limestone, and granite from oil stains, water ingress, and algae growth while enriching natural stone tones.
Garden Paths and Courtyards: This product creates a satin finish that reduces dusting and improves cleaning ease in high-footfall outdoor spaces.
Pool Surrounds and Steps: When combined with a silica additive, this product provides a discreet, anti-slip option, ensuring a safer walking surface in wet areas.
Commercial Plazas and Outdoor Dining Areas: Enhances visual appeal with colour stability and protects against UV degradation and heavy pedestrian traffic.
Interior Stone Floors and Feature Walls: These are suitable for interior natural stone installations where low sheen, stain resistance, and easy cleaning are desired.

Application Instructions

Surface Preparation

Ensure the surface is completely dry, clean, and free from oil, dirt, moss, or efflorescence.
Remove any existing silicone or stearate-based sealers, as they can prevent proper adhesion.
If applying outdoors, confirm that no rain is forecast for at least 24 hours after application.
Test a small, inconspicuous area first to verify compatibility and desired appearance.

Mixing

Stir the product thoroughly for 2–3 minutes before use.
The sealer is ready to use and should not be diluted.
If using the anti-slip version, gradually add the supplied silica grit while stirring to ensure even distribution.

First Coat

Apply a thin, even film using a brush, roller, or low-pressure sprayer.
Work in sections, keeping a wet edge to avoid overlap marks.
Do not pour the product directly onto the surface.
Allow complete absorption without puddling. Wipe off any excess residue to avoid whitening.

Second Coat

After 4–6 hours (when the first coat is touch-dry), apply the second coat at right angles to the first for uniform coverage.
Coverage rate improves on the second coat due to reduced surface porosity.

Curing Schedule (@ 18 °C)

Touch Dry: 2–4 hours
Light Foot Traffic: 12 hours
Vehicle Traffic: 24 hours
Full Weatherproof Cure: 7 days

During curing, protect the surface from rain, dust, and heavy use to ensure full bond and clarity.

Maintenance Guidance

Clean regularly with a mild detergent or stone-safe cleaner, and avoid harsh acids or bleach.
Reseal every 4–5 years, or sooner if water no longer beads on the surface.
For ongoing protection, apply a maintenance coat to high-traffic areas annually.

Extreme Seal Advanced Limestone Sealer ensures your stone surfaces remain vibrant, protected, and easy to maintain. It delivers professional-grade performance with a simple, reliable application.

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Frequently Asked Questions

What surfaces can I use Extreme Seal Advanced Limestone Sealer on?

Suitable for Indian sandstone, natural limestone, slate, granite, and concrete paving. Ideal for patios, driveways, and courtyards. Avoid non-porous stone, resin grouts, or surfaces previously sealed with silicone or stearate repellents.

Can it be used on newly installed stone or patio paving?

Yes, but only after the surface and pointing are fully dry and cured — typically 4–6 weeks after installation — to prevent clouding or poor adhesion.

Does the sealer change the colour of the stone?

It creates a subtle satin finish that slightly deepens natural tones without gloss, enriching colour while preserving a natural look.

Is it safe for indoor use?

Yes, the low-odour, solvent-free formula makes it suitable for interior stone floors, walls, and hearths. Ensure good ventilation during use.

How many coats do I need to apply?

Two thin coats are recommended — the first penetrates the surface, and the second enhances durability and colour uniformity.

How long will the protection last?

When properly applied, it offers up to 5 years of protection, depending on stone type, exposure, and maintenance.

Can it be applied with a sprayer?

Yes, it can be applied using a low-pressure sprayer, roller, or brush. Avoid over-application and pooling to prevent whitening or patchiness.

Is it safe for pets, plants, and the environment?

Once dry, the coating is completely safe. Keep pets and plants away during application until the surface has fully cured.

How soon after application can I walk or drive on the surface?

Light foot traffic is safe after 12 hours and vehicles after 24 hours (at ≈18 °C). Full chemical and weather resistance develops in 7 days.

Will it stop moss and algae growth completely?

It greatly reduces growth by preventing moisture absorption, but occasional cleaning may still be required in shaded or damp areas.

Can I reapply it over an older sealed surface?

Only once the old coating has worn off and the stone has regained porosity. Always patch-test for compatibility before full application.

How can I tell when to reseal my stone?

Perform a water-bead test — if water soaks in instead of beading, it’s time to reapply.

What is the recommended temperature for applying this product?

Apply between 10 °C and 25 °C in dry, calm conditions. Avoid extreme heat, frost, or rain within 24 hours of coating.

Can I use this on vertical surfaces like stone walls?

Yes, apply in thin coats with a brush or low-pressure sprayer, starting at the bottom and working upward to prevent runs or streaks.

What maintenance is needed after sealing?

Clean regularly with mild detergent and water. Avoid acidic cleaners or jet washing. Reapply every few years to maintain protection and appearance.

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£49.99 (inc VAT)

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Size

5 Litres 20 Litres

Finish

Wet look Matt look

Material

Anti Slip Non Anti Slip

Product variants

*subject to stock levels at the time of your order.