GK Invisible Stone Sealer 3Ltr

Product Description

What Is a Stone Sealer and Why Does Natural Stone Need One?

Natural stone, whether Indian sandstone, limestone, slate, granite, marble, or porcelain, is a porous material. Its pore structure is what gives it character and texture, but it also means the stone absorbs everything it comes into contact with: rainwater, cooking oil from a barbecue, wine spilled on an outdoor dining table, engine oil tracked from a car, algae spores, and airborne contaminants.

Without a stone sealer, these substances penetrate below the surface and cause staining that becomes progressively harder to remove the longer it sits, and in the case of moisture, it creates the conditions for biological growth, freeze-thaw surface damage, and long-term deterioration of the stone.

A stone sealer is a treatment applied to the pore structure of the stone, not on top of it, that creates a barrier between the surface and contaminants. When applied correctly, it means that substances which contact the stone surface sit on top of the sealed pores rather than being absorbed into them, allowing them to be wiped or rinsed away cleanly. For outdoor stone paving, this is the difference between a surface that stains permanently and one that stays clean and maintainable for years.

GK Invisible Stone Sealer is a professional-grade penetrating stone sealer that delivers this protection while leaving the stone's appearance completely unchanged with no sheen, no darkening, and no visible coating. The stone looks exactly as it should. The protection works invisibly from within.

The Technology Behind It: Short-Chain Per-Fluorinated Polymer

Most stone sealers on the market fall into two broad categories: film-forming sealants that sit on top of the stone and create a visible surface coating, and penetrating impregnating sealers that absorb into the pore structure and work from within. GK Invisible Stone Sealer is in the second category, but what distinguishes it from most penetrating sealers is the technology at its core.

GK Invisible Stone Sealer is developed using short-chain per-fluorinated polymer technology: a class of chemistry that creates a molecular barrier within the stone's pore walls, repelling both water-based and oil-based substances simultaneously. This dual repellency is not something that standard silicone or acrylic-based stone sealers can deliver. They repel water but do not provide meaningful resistance to oil and grease penetration.

The per-fluorinated polymer molecules bond to the interior pore walls of the stone without filling or blocking the pores themselves. This is what makes the sealer breathable, allowing moisture vapour to still travel through the stone and evaporate from the surface, while liquid water and oil are repelled at the pore wall and prevented from penetrating.

For outdoor paving in particular, this breathability is critical: it allows sub-base moisture to continue escaping upward through the stone, preventing the efflorescence and surface damage caused by trapped moisture that non-breathable film sealants can produce.

What GK Invisible Stone Sealer Protects Against

Once applied, the sealed surface resists a comprehensive range of common staining and contamination:

• Water and moisture: the primary cause of biological growth, freeze-thaw surface damage, and efflorescence in outdoor stone.
• Oil and engine grease: driveways, parking areas, and surfaces near vehicles where petroleum contamination is common.
• Cooking oils and fats: outdoor dining areas, barbecue patios, and kitchen terraces exposed to food preparation.
• Food and beverage staining: the sealer is tested against ketchup, mustard, tea, coffee, and wine, making it practical for outdoor entertaining surfaces that see regular food and drink use.
• Dirt and grime: sealed surfaces resist dirt pickup, remaining cleaner for longer between maintenance cycles.
• Algae, moss, and biological growth: the sealed pore structure is inhospitable to biological establishment, significantly slowing the rate at which algae and moss colonise treated surfaces.

Suitable for All Natural Stone: Including the Most Sensitive

GK Invisible Stone Sealer's water-based, per-fluorinated polymer formula is safe for use on all natural stone types, including those that are too sensitive for many conventional stone sealers:

• Indian sandstone and sandstone paving: highly porous and one of the stones that benefits most from early sealing.
• Limestone: sensitive to acidic cleaners and chemical treatments; GK Invisible Stone Sealer is pH-neutral and completely safe on limestone.
• Slate: both indoor and outdoor applications, including riven and smooth finishes.
• Granite: including honed and polished granite finishes that are vulnerable to acid etching and some sealing products. This formula is confirmed safe on all granite finishes.
• Marble: indoor and outdoor marble, including polished marble that must not be treated with acid-based or reactive chemistry.
• Polished and exposed concrete: indoor polished concrete floors and outdoor concrete paving surfaces.
• Block paving: protecting both the paving surface and the jointing sand from staining and biological contamination.

One critical requirement: GK Invisible Stone Sealer is an impregnating sealer that requires a porous, absorbent substrate to work. It cannot be applied over painted surfaces, previously silicone-treated stone, non-porous tiles, or any other non-absorbent surface. If in doubt, apply a small amount of water to the surface, and if it soaks in, the stone is porous and the sealer will work. If it beads, the surface is sealed or non-porous and a different approach is required.

Invisible by Design: Sealing Stone Without Changing It

The name says everything about the most important characteristic of this product from a user perspective: once applied and absorbed, GK Invisible Stone Sealer is completely invisible. No sheen. No colour change or darkening. No surface film. The stone retains exactly its natural appearance and texture, as if nothing has been applied.

This makes it the ideal stone sealer for customers who want protection without altering the aesthetic of their paving. It is equally valuable on pale, natural-look sandstone where a wet-look or enhancing sealer would change the character of the stone entirely, and on premium granite or marble where any visible coating would be immediately noticeable. For these surfaces, an invisible stone sealer is not a preference, it is the only appropriate type of product.

For customers who want to enhance and enrich the colour of their stone rather than preserve its natural appearance, a colour-enhancing or wet-look sealer would be the more appropriate product.