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Xtraseal MC-228 Multi-Color Flexi Gap Sealant: A Technical Overview
Xtraseal MC-228 is a next-generation tile joint sealant based on nanotech polymer and cosmetic-grade pigments. Designed for aesthetic and functional performance, it delivers a non-shrinking, water-resistant finish with a porcelain-like gloss. The two-part formula mixes automatically in the nozzle, providing uniform texture and colour. With a working time of 30–45 minutes and full cure in 24 hours, it supports rapid job site turnover. Suitable for ceramic, porcelain, marble, travertine, and granite across kitchens, bathrooms, balconies, and window trims.
Core Features & Specifications
- VOC-free formula for safer indoor use
- Glossy finish mimics polished porcelain for premium aesthetics
- Waterproof and mildew-resistant performance
- Cures in 2–3 hours (touch), 24 hours (full)
- Hardness Shore D 50+ ensures joint integrity
- Temperature resistant from 15°C to 120°C – suitable for Australian conditions
- Colour blends during extrusion – no pre-mixing required
- Suitable for indoor tiles, countertops, balcony trims, and wet areas
The Xtraseal MC-228 Advantage
- Reduces callbacks due to its strong, non-shrinking finish
- Delivers luxury-grade finish to tiled interiors and wet areas
- Easy cleanup using alcohol or scraper — even after cure
- Minimises downtime with fast cure and early hardness
- Shelf stable for 24 months in proper storage conditions
Best Practices: Do's & Don'ts
Do
- Test on a small area first to ensure substrate compatibility
- Use masking tape for clean edge control before sealing
- Smooth sealant with a stainless steel tool for consistent finish
- Store between 5°C and 30°C in a cool, dry place
Don't
- Don’t use on polyethylene (PE), polypropylene (PP), or PTFE surfaces
- Don’t apply on wet or dusty gaps without cleaning first
- Don’t overwork the joint after application – it may disrupt curing
Applications in Practice: Trade Scenarios
For Tilers (On-Site Applicator): Premium Bathroom Joint Finish
The Engineering Challenge
Tilers often face inconsistent grout finishes in wet zones like showers where water exposure leads to mildew or discolouration. Aesthetic outcomes matter in premium homes and apartments.
The System-Based Solution with Xtraseal MC-228
Apply MC-228 to clean tile joints with masking for a crisp edge. Its 1:1 resin-hardener mix ensures even colour. Use a stainless steel stick to smoothen. Cure within 3 hours; full bond in 24 hours. Long-term gloss finish is mildew-proof and resists soap and moisture build-up.
Best Practice Note
Always remove masking tape within 30 minutes and clean excess with alcohol before full cure. Avoid damp environments for the first 5 hours.
For Builders (Business Owner): Balcony Tile Edge Sealing
The Engineering Challenge
Balcony edging often sees joint cracking or water ingress, especially in hot or tropical regions. Builders need a product that can handle UV exposure, expansion, and movement.
The System-Based Solution with Xtraseal MC-228
MC-228’s Shore D 50+ hardness and 15°C–120°C range makes it ideal for external tiling edges. Apply to clean joints with proper masking. Full cure in 24 hours ensures ready handover.
Best Practice Note
Avoid sealing during rain or extreme heat. Allow 5 hours still time post-application before exposure.
Performance Benchmark: Xtraseal MC-228 vs. Standard Alternatives
| Metric | Xtraseal MC-228 | Standard Alternative | Advantage |
|---|---|---|---|
| VOC Content | 0% No Indoor Emissions | 3–7% | Healthier for indoor use |
| Cure Time (Touch) | 2–3 Hours Fast | 6–12 Hours | Speeds up job completion |
| Shore D Hardness | ≥50 Durable | 30–40 | Stronger bond with less cracking |
Frequently Asked Questions
What surfaces can Xtraseal MC-228 be used on?
Xtraseal MC-228 is compatible with most common tiles including ceramic, porcelain, travertine, marble, and granite. It is not suitable for low-energy surfaces like PE, PP, or PTFE. For best results, ensure the substrate is clean, dry, and dust-free before application.
How long does Xtraseal MC-228 take to cure?
Xtraseal MC-228 has a working life of 30–45 minutes at 25°C. It sets within 2–3 hours and reaches full cure in 24 hours. Ensure the sealed area remains still and undisturbed for the first 3–5 hours to prevent defects.
Can I apply Xtraseal MC-228 in wet areas like bathrooms or showers?
Yes. Xtraseal MC-228 is specifically engineered for wet-area applications. It is waterproof, mildew-resistant, and non-shrinking, making it ideal for bathrooms, showers, kitchen splashbacks, and laundries.
Do I need a primer before applying Xtraseal MC-228?
No primer is typically required when applying MC-228 on clean, dust-free tile surfaces. However, on unglazed or porous substrates, a test application is recommended to ensure bond strength. For critical installations, consult the substrate manufacturer or Adheseal technical support.
What tool should I use to smooth the sealant?
Use a stainless steel tooling stick for best results. Smooth the bead immediately after gunning while it's still workable. Remove masking tape within 30 minutes to avoid tearing the edge. Excess product can be cleaned with alcohol or a scraper once cured.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Sealing gaps between ceramic or porcelain tiles | Delivers a high-gloss, porcelain-like finish that elevates tiled surface aesthetics | Tilers, Builders |
| Joint sealing in wet areas (bathrooms, showers, laundries) | Waterproof and mildew-resistant, reducing maintenance and mould growth | Tilers, Plumbers, Waterproofers |
| Kitchen splashback tile finishing | VOC-free and easy to clean, suitable for indoor environments with food contact surfaces nearby | Cabinetmakers, Kitchen Installers |
| Balcony tile edge and perimeter sealing | Handles expansion and weather exposure with strong adhesion and high-temperature resistance | Builders, Waterproofers |
| Window sill tile trimming and aesthetic edge finishing | Fine nozzle application with glossy finish provides a decorative solution to visible joint gaps | Glaziers, Tilers |
Applying Xtraseal MC-228 Multi-Color Flexi Gap Sealant: Enhanced Protocols & Best Practices
-
Surface Preparation
Clean the tile gaps thoroughly to remove any dust, debris, or moisture. Ensure the surfaces are dry before proceeding. Mask adjacent tile edges with painter's tape to maintain clean lines and avoid overspill.
Timing: Allow any washed surfaces to dry completely (min. 30 mins) before application.Pro Tip: Use a vacuum for dust removal on porous tiles like travertine. -
Cartridge Preparation
Insert the MC-228 cartridge into a professional-grade caulking gun. Ensure the mixing nozzle is securely attached. Before application, gun out the first 30–40cm of sealant to ensure a uniform mix of resin and hardener.
Timing: Mix discard time: 30–60 seconds of continuous extrusion.Pro Tip: Keep a waste container nearby to dispose of the initial mixed portion quickly. -
Application to Joints
Position the nozzle tip slightly smaller than the tile gap width. Apply a steady bead along the joint, filling it flush. Use a stainless steel tooling stick to smooth the surface and ensure even compression into the joint.
Timing: Tool the joint immediately after application. Do not exceed 30 minutes before smoothing.Pro Tip: Apply in small sections to maintain workability within the 45-minute pot life window. -
Finishing and Curing
Remove masking tape after 30 minutes or before the sealant begins to skin. Allow the sealant to sit undisturbed for 3–5 hours. Full cure is achieved after 24 hours at 25°C.
Timing: Initial cure: 3–5 hours. Full cure: 24 hours.Pro Tip: If any excess is present after curing, remove it using a plastic scraper or clean it off with alcohol before full set.
Limitations & Safety
Product Limitations
Not suitable for use on PE (polyethylene), PP (polypropylene), or PTFE (Teflon) surfaces due to poor adhesion characteristics.
Avoid application on wet or actively leaking surfaces. Substrates must be completely dry before use.
Product may stain absorbent or unsealed natural stone surfaces such as limestone or sandstone. Conduct a test patch before full use.
Not UV-rated for direct prolonged sun exposure. For exterior use on exposed joints, confirm suitability with technical support.
Safety & Handling Requirements
Personal Protective Equipment
Use nitrile gloves and protective eyewear during application. Avoid direct skin contact with uncured sealant. Wash hands thoroughly with soap and water after use.
Ventilation Requirements
Ensure adequate ventilation in enclosed spaces, although the product is VOC-free. Open windows or use extraction fans if applying in tight, non-ventilated areas.
Fire & Handling Precautions
Xtraseal MC-228 is not classified as flammable, but avoid contact with open flames or high heat during application and storage. Store between 5°C and 30°C in original packaging.
Emergency First Aid
Eyes:
Immediately flush eyes with clean water for at least 15 minutes. Seek medical advice if irritation persists.
Skin:
Remove contaminated clothing and wash skin thoroughly with soap and water. Seek medical attention if skin irritation develops.
Inhaled:
Move the person to fresh air. If breathing is difficult or symptoms persist, seek immediate medical assistance.
Swallowed:
Do NOT induce vomiting. Rinse mouth and seek immediate medical attention.
Seek medical attention immediately in all cases of serious exposure.
Xtraseal MC-228 Multi-Color Flexi Gap Sealant Application Guide
Ceramic Tiles
Surface Preparation
Ensure joints are clean, dry, and free of dust or oil. Use a brush or vacuum to remove particles. Wipe the surface with isopropyl alcohol if greasy or stained. Apply masking tape along tile edges to avoid excess smearing.
No primer typically required
Ceramic tiles offer excellent adhesion with MC-228. Apply directly once surface is properly cleaned.
Porcelain Tiles
Surface Preparation
Porcelain tiles must be cleaned thoroughly to remove any polishing residue. Dry joints are essential. Masking tape is recommended to control sealant boundaries and ensure a sharp finish.
No primer typically required
Due to its dense surface, MC-228 bonds well without primer if surface is clean and dry.
Marble & Granite
Surface Preparation
Stone surfaces must be dry and free of any polishing wax or sealants. Clean with a pH-neutral detergent and allow to fully dry. Avoid acidic cleaners.
Primer recommended for optimal adhesion
While MC-228 adheres to polished stone, priming with a stone-compatible primer may enhance bond longevity, especially in wet areas.
Travertine
Surface Preparation
Clean thoroughly with a vacuum or dry brush to remove debris from pores. Allow to dry fully before sealing. Use masking tape to control bead width.
Primer recommended for optimal adhesion
For porous substrates like travertine, a penetrating primer may help reduce absorption and improve bonding uniformity.
Unglazed or Matte Tiles
Surface Preparation
Remove surface dust with a soft brush or lint-free cloth. For best results, test adhesion on a small patch. Ensure surface is completely dry prior to application.
Primer required for critical applications
Use a compatible tile primer to enhance adhesion on highly porous or powdery matte tiles. Test first before full application.
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