MACt Seal Final Concrete Sealer

MACt Seal Final Coat (1L)

Price range: $203.50 through $3,272.50 Inc GST

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MACt Seal Final Coat is a specialised, two-component urethane-acrylic hybrid designed as the ultimate protective topcoat for GFRC (Glass Fibre Reinforced Concrete) projects. By bonding a silicon-repellent layer to previously sealed surfaces, this final coat adds robust water resistance, exceptional scratch protection, and non-yellowing clarity. Whether applied to concrete basins, baths, or benchtops, MACt Seal Final Coat offers a user-friendly, low-foaming formulation that maintains a natural, colourless finish—and you can customise the sheen level from a subtle matte to a brilliant high gloss.

Key Features & Benefits

  1. Advanced Water Repellence
    • Silicon Repellent: Bonds seamlessly to sealed surfaces, delivering enhanced moisture and contaminant resistance.
    • Ultimate GFRC Protection: Perfect for high-exposure applications like basins, baths, and countertops.
  2. Flexible Finish Options
    • Multiple Heavy Coats: Build a rich, high-gloss finish—though extended cure times are required for complete cross-linking.
    • Fewer, Thinner Coats: Achieve a faster-curing, matte sheen with minimal impact on drying time.
  3. Easy Mixing & Application
    • 16:1 Base-to-Activator Ratio: Consistent, straightforward dosing ensures optimal performance.
    • Two-Hour Work Window: Plenty of time to apply the final coat before the mixture sets.
    • Foam Roller-Friendly: Non-foaming formulation minimises roller lines and overlap marks.
  4. High Scratch & Contaminant Resistance
    • Superior Durability: Guards against abrasions and stains, preserving the pristine look of polished GFRC surfaces.
    • UV-Stable & Non-Yellowing: Maintains clarity and colour fidelity over the product’s lifetime.
  5. Single, Lasting Top Layer
    • Final-Layer Only: Must be applied after base sealing coats; attempting to coat over Final Coat will lead to surface rejection.
    • Long-Term Hardness: Achieves final cure in 7 days, delivering outstanding longevity and resilience.

Recommended Usage & Application

  1. Mixing
    • Base : Activator = 16:1 by Volume: Carefully weigh or measure the correct activator amount, add to the base, and stir thoroughly for ~3 minutes.
    • Work Time: Approximately 2 hours post-activation; only mix the amount needed for one complete topcoat.
  2. Application
    • Apply After Base Sealer: Ensure the underlying sealer coats are cured and free of any surface defects.
    • Foam Roller Method: The special low-foaming formula applies smoothly with minimal fuss. Back rolling is optional.
    • Multiple Heavy Coats or Fewer Thin Coats: Heavier coats need longer cross-link times (producing higher gloss), while thinner coats cure faster with a matte result.
  3. Curing Guidelines
    • Initial Cross-Link: 24 hours for the first reaction; avoid heavy traffic or moisture exposure during this period.
    • Final Hardness: Complete at around 7 days—ideal for maximum scratch and stain resistance.
  4. Important Note
    • Final Layer Only: MACt Seal Final Coat cannot be resealed over; any future sealing attempt requires mechanical removal down to the concrete substrate.

Technical Specifications

AttributeDetail
TypeTwo-component urethane-acrylic hybrid
Base : Activator Ratio16:1 by volume
Pot Life~2 hours post-mixing
Application MethodFoam roller recommended (minimal lines; back rolling optional)
FinishVariable from matte (thin coats) to high gloss (heavy coats)
Dry to TouchVaries with humidity and coat thickness; allow sufficient drying between coats
Full Cure~24 hours initial cross-link, 7 days final hardness
Non-YellowingUV-stable formula ensures clarity and colour fidelity over time
Coverage & CoatsAdjust number and thickness of coats for desired gloss level; avoid over-application
StorageKeep in a cool, dry environment; do not freeze

Why Choose MACt Seal Final Coat?

  • Enhanced Water Repellence: Specifically designed to protect GFRC products from moisture intrusion and other contaminants.
  • Durable Topcoat: High scratch resistance and superior abrasion performance, ensuring a long-lasting finish.
  • Versatile Aesthetics: Easily achieve anything from a subtle, matte sheen to a deep, high-gloss surface.
  • Single, Definitive Layer: Meant to cap off your sealing process, delivering maximum protection and minimal maintenance.
  • User-Friendly Application: Low-foaming and tolerant formulation ensures a smooth, professional finish, even for newcomers.
MACt Seal Final Coat is the ultimate last step in securing top-tier performance and beauty for GFRC pieces. By forming a silicon-repellent, non-yellowing film, it locks out moisture, improves stain resistance, and enhances the appearance of your concrete projects—be they kitchen benchtops, bath surfaces, or decorative elements. With its easy mixing ratio, flexible finishes, and robust protection, MACt Seal Final Coat is an indispensable choice for artisans and professionals aiming to extend the life and appeal of their GFRC creations. 

Additional information

Weight1.3 kg
Dimensions13.5 × 7 × 18 cm
Capacity

1L, 20L

We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.
To start a return, you can contact us at sales@mact.au
Please note that returns will need to be sent to the following address:
Unit 3C, 919-925 Nudgee Road, Banyo, QLD, 4014, Australia
If your return is accepted, we’ll send you instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted. Please note that if your country of residence is not Australia, shipping your goods may take longer than expected.
You can always contact us for any return questions at sales@mact.au

Expect prompt delivery and easy tracking — every order comes with updates along the way.

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Got any question?

Browse through our frequently asked questions to find answers on everything from mould preparation and casting techniques to finishing and long-term maintenance.

Australia’s warm and, in many regions, coastal climate necessitates adjustments during manufacturing. High temperatures can accelerate hydration, so controlled curing environments—such as covering pieces with plastic to retain moisture—are essential. Additionally, lower water-to-cement ratios and carefully selected admixtures help mitigate rapid evaporation and ensure that GFRC develops its designed strength and durability.

Manufacturers address these challenges by:

  • Using precision mixing equipment to achieve a uniform blend and ensure proper fibre distribution.
  • Fine-tuning spray parameters (such as pressure, nozzle design and technique) to avoid voids, pinholes and surface defects.
  • Regular maintenance of equipment and continuous operator training.
  • Adjusting admixture dosages as required to optimise workability and adhesion.

Future trends include increased automation—such as robotic spraying and digital mould design—as well as a greater focus on sustainable practices (e.g. incorporating recycled materials and eco-friendly admixtures). Advances in fibre treatment technology and computer-aided manufacturing are enabling more complex, custom-designed panels. Ongoing research is continually refining mix designs and curing methods to better suit Australia’s diverse environmental conditions.

GFRC is a composite product that combines high‐quality cement, fine aggregates, polymers and alkali‐resistant glass fibres – all premixed to the correct proportions. Its high strength‐to‐weight ratio, durability and capacity for being cast in thin, custom shapes make it ideal for creating stylish and long-lasting benches and tables for both indoor and outdoor use.

GFRC manufacturers must comply with Australian building codes and standards relating to precast concrete, structural performance and safety. This means that production processes, material testing and installation methods are stringently monitored and documented. Close collaboration with local certifying bodies ensures that GFRC products meet all necessary performance and regulatory requirements.

With our premix product, all the ingredients are already proportioned for optimal strength and workability. This means you can focus on preparing your moulds and executing a neat cast rather than measuring raw materials.

Moulds for benches and tables can be constructed from high-density foam, melamine, or even silicone for more intricate designs. It is essential that the mould is smooth, watertight and well supported. Pre-treat the interior with a quality release agent to ensure that the cured GFRC can be removed cleanly.

Typical additional admixtures levels for a 20kg:

  • Water: 2.78L–3.0L
  • Plasticiser: 10g – 50g
  • Fibres HD: 50g-300g
  • Fibres Bundled: 400g-700g
  • Retarder: 5g-20g
  • Accelerator: 5g–20g
  • Defoamer: 1g-3g
  • Colour: up to 800g

*NOTE: All admixes will alter the way the mix behaves.

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