Prime Formgel | Exposed Aggregate Concrete Formwork Retarder
$190.00 AUD
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$190.00 AUD
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Prime Formgel | Exposed Aggregate Concrete Formwork Retarder
Prime Formgel is a water-soluble concrete formwork retarder designed to expose aggregate in concrete. Applied to formwork before the concrete pour, the thick gel retards the surface cement paste, allowing the formwork to be removed and the concrete surface exposed after curing.
The thick gel formulation helps maintain coverage on vertical and horizontal formwork, while the fluorescent green colour makes application easy to see and helps reduce missed areas. Prime Formgel is ready to use straight from the drum and should not be diluted or mixed before application.
After the formwork is removed, the retarded surface slurry can be removed using a stiff broom and hose or a high-pressure cleaner to reveal the aggregate. Exposure time is dependent on weather conditions, concrete strength and other site conditions, with Prime indicating a typical wash-off window of approximately 6–48 hours after pouring.
$190.00 AUD
Sale price
$190.00 AUD
Regular price
Price Includes GST
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HOW MUCH SEALER DO I NEED?
Measure Your Area in Square Metres
To calculate how much sealer you'll need, measure the length and width of each concrete area and multiply them together.
Formula:
Length (m) × Width (m) = Total Area (m²)
Example:
Driveway: 10m long × 4m wide = 40m²
If your project has multiple sections, calculate each area separately and add them together.
Tips:
• Measure in metres for the most accurate result.
• Include driveways, paths, patios and pool surrounds.
• Round up your measurements if unsure.
• Our calculator includes an allowance for product absorption and application rates.
Take the Guesswork Out of Cleaning & Sealing and use our coverage calculator to estimate your sealer requirements in minutes and start your project knowing you've got the right amount of product.
*Recommended for this product: 2 coats
CONCRETE SEALING & SEALER FAQ'S
How much concrete sealer do I need?
Coverage rates vary depending on the product, surface type, porosity and number of coats applied. Use the coverage calculator above to estimate the amount of sealer required for your project. Porous surfaces typically require more product, while dense or previously sealed surfaces often achieve greater coverage. Always allow a small amount of extra product to ensure complete coverage.
How many coats should I apply?
Most concrete sealers achieve the best results with two coats. The first coat penetrates and bonds to the surface, while the second coat provides additional protection, durability and finish enhancement. Highly porous concrete may require additional product or coats to achieve the desired appearance and performance. Always refer to the product Technical Data Sheet (TDS) for specific application recommendations.
Can I apply this product myself?
Yes. Many of our products are suitable for DIY application when used according to the manufacturer's instructions. Proper surface preparation, suitable weather conditions and correct application techniques are essential for achieving professional results. Always read the Technical Data Sheet (TDS) before commencing your project.
How do I prepare concrete before sealing?
The surface should be clean, dry and free from dirt, grease, mould, algae, efflorescence and any existing failing coatings. Depending on the condition of the concrete, preparation may involve pressure cleaning, degreasing, acid etching, grinding, crack repairs or coating removal. Proper preparation is critical to achieving good adhesion and long-term sealer performance.
How do I prepare new or green concrete before sealing?
New concrete must be allowed to properly cure before sealing. The recommended curing period varies depending on the type of sealer being used and the manufacturer's recommendations. Before sealing, the surface should be clean, dry and free from curing compounds, laitance, construction debris and contaminants that may affect adhesion.
Some concrete surfaces may require acid etching, grinding or pressure cleaning to open the surface and promote sealer penetration. Always refer to the product Technical Data Sheet (TDS) for minimum curing times and preparation requirements before application.
Can this product be applied over an existing sealer?
Application over existing coatings depends on the type and condition of the original sealer. Some products are compatible with existing coatings, while others may cause adhesion issues, whitening, peeling or coating failure. If your concrete has previously been sealed, we recommend performing a compatibility test or contacting us for advice before application.
Should I dilute the first coat of solvent-based concrete sealer?
It depends on the porosity of the concrete and the weather conditions during application. For dense or less porous concrete surfaces, we generally recommend diluting the first coat with up to 30% xylene to improve penetration and adhesion. This helps the sealer soak into the surface rather than sitting on top, resulting in better bonding and long-term performance.
For highly porous concrete, dilution is often not required as the surface will readily absorb the sealer. Depending on the porosity of the concrete, additional coats may be required to achieve the desired finish and protection.
Always refer to the product Technical Data Sheet (TDS) for specific dilution recommendations.
Can xylene be used for cleanup?
Yes. Xylene is commonly used for cleaning rollers, brushes and equipment after applying solvent-based acrylic concrete sealers. It can also be used during maintenance and recoat applications to help soften and reactivate compatible solvent-based acrylic sealers.
However, xylene is a powerful solvent and can damage, soften or remove incompatible coatings, paints, plastics, rubber, asphalt and certain decorative finishes. Always test in an inconspicuous area before use and avoid contact with surfaces that may be affected by strong solvents.
Xylene should only be used with compatible solvent-based products and must be handled in accordance with the Safety Data Sheet (SDS). Always ensure adequate ventilation, wear appropriate PPE and follow all safety precautions during use.
How long before I can walk on the sealed surface?
Under normal weather conditions, most sealed surfaces can be walked on within 24 hours of the final coat. Drying times may vary depending on temperature, humidity, product type and ventilation. Refer to the product Technical Data Sheet (TDS) for specific drying and curing information.
How long before I can drive on the sealed surface?
For most concrete sealing applications, vehicle traffic should be kept off the surface for approximately 5 to 7 days after the final coat. This allows the sealer to properly cure and develop maximum durability. Premature vehicle traffic may damage the coating and affect the final finish.
Where can I find the TDS and SDS?
Technical Data Sheets (TDS) and Safety Data Sheets (SDS) are available on each product page under the Downloads section. These documents contain important information regarding coverage rates, surface preparation, application methods, drying times, safety requirements and product limitations. We recommend reviewing the TDS and SDS before commencing any project.
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