You've laid the tiles. Now, to finish. That final line needs to be as clean, as bright, and as permanent as the tiles themselves. MC-228 delivers that perfect finish. It’s a two-part nano-tech polymer engineered to fill and beautify tile gaps, curing into a rock-solid, glossy, and permanently mould-resistant joint that looks like porcelain.

Why this product exists

Traditional grouts often discolour, stain, and harbour mould, especially in wet areas. MC-228 was formulated with German nano-tech polymer technology to eliminate these common failures. It mixes inside the nozzle, creating a robust, zero-VOC, solid that's impervious to water and mildew. This means permanent, low-maintenance, and aesthetically consistent tile joints, particularly in bathrooms, kitchens, and other humid environments where long-term performance and appearance matter.

The numbers that matter

MC-228 cures to a Shore D Hardness above 50. This means it forms a rigid, durable bond, unlike flexible sealants. With 100% non-volatile content and zero VOC, what you apply stays in the gap, and it does so without off-gassing harmful compounds. It delivers a full-bodied, dense fill that won't shrink, ensuring a stable and long-lasting joint without callbacks for settling or cracking.

What it's like to use

Application is straightforward, provided you prepare correctly. Work within an application temperature range of 15°C to 45°C. The dual components mix automatically as you extrude, but always gun out the first 30cm to 40cm into waste to ensure a uniform blend. Use masking tape to define your joint edges, then fill the gap with the nozzle tip smaller than the gap width. Tool with a stainless steel stick, then remove the tape within 30 minutes, before it sets. MC-228 begins to set in 3 to 5 hours, achieving full cure within 24 hours. Clean wet material with Adheseal Methylated Spirits 95% General Purpose Solvent; dry material requires mechanical removal.

Where this product excels

• Kitchens and Bathrooms: Achieve consistently clean, bright lines for splashbacks, benchtops, and shower walls. Its permanent mould resistance eliminates unsightly discolouration common with traditional grout.
• High-End Tiling: For travertine, marble, ceramic, porcelain, and granite, this sealant provides a glossy, porcelain-like finish that complements the tile's own sheen, elevating the overall aesthetic.
• Balconies and Windowsills: Offers a durable, water-resistant seal that holds up against moisture exposure, maintaining integrity and appearance where weather can take its toll.

Choose this when

• You need a rigid, high-gloss finish: For tile gaps where a hard, porcelain-like appearance is desired over flexibility.
• Mould resistance is critical: In wet areas like showers, laundries, and kitchens where hygiene and appearance are non-negotiable.
• Working with premium tiles: To complement the finish of ceramic, porcelain, marble, or granite without compromising their aesthetic.
• VOC-free application is required: For indoor environments, especially near food preparation areas, where air quality is a concern.

Don't use this when

• Not for: Adheseal Hi-Flex 50 Low-Modulus Waterproofing Membrane. This product cures to a Shore D hardness above 50, making it rigid. For joints requiring significant movement accommodation, consider a flexible sealant like Hi-Flex 50.
• Not for: Structural bonding applications. MC-228 is designed for tile gap sealing and beautification, not load-bearing adhesion.