Frequently Asked Questions
About Europe Concrete Shop
What is Europe Concrete Shop?
Europe Concrete Shop is a European specialist in GFRC, decorative concrete, concrete sealers, pigments and molds. We supply high-quality materials for professionals, makers, designers and DIY enthusiasts who work with concrete.
Our products can be used for a wide range of applications, including concrete countertops, sinks, tables, furniture, wall panels, decorative objects and custom concrete projects.
Do you sell to both professionals and private customers?
Yes. We supply both professional and private customers.
Whether you are producing concrete products commercially or working on your first DIY project, we are happy to help you choose suitable products.
Do you offer technical advice?
Yes. If you have questions about product selection, mixing, casting, sealing or finishing your concrete project, please contact us.
To help us give you the best advice, please include information about your project, such as the application, dimensions, desired finish and the products you are planning to use.
GFRC
What is GFRC?
GFRC stands for Glass Fiber Reinforced Concrete.
GFRC is a type of concrete reinforced with alkali-resistant glass fibres. These fibres help improve the strength and durability of the concrete while allowing products to be made thinner than traditional concrete.
GFRC is commonly used for countertops, sinks, tables, furniture, wall panels, decorative objects and architectural elements.
What is the difference between GFRC and traditional concrete?
Traditional concrete is often reinforced with steel reinforcement or steel mesh and generally requires a greater thickness.
GFRC uses specially designed alkali-resistant glass fibres distributed throughout the concrete. This makes it possible to create relatively thin, strong and detailed concrete products.
GFRC is particularly popular for decorative and design applications where weight, thickness and surface finish are important.
Is GFRC suitable for beginners?
Yes. GFRC can be suitable for beginners, especially when using a complete and properly formulated GFRC system.
However, good preparation is important. Always follow the recommended mixing ratios, processing instructions and curing requirements for the products you are using.
Can I make a concrete countertop with GFRC?
Yes. GFRC is widely used for concrete countertops because it can create strong and relatively thin concrete surfaces.
A concrete countertop can be cast in a mold and finished using grinding, polishing and sealing techniques, depending on the desired final appearance.
Can I make a concrete sink with GFRC?
Yes. GFRC is suitable for making custom concrete sinks and washbasins.
When making a sink, it is important to use the correct reinforcement, mixing technique and mold construction. After curing, the concrete should be properly sealed with a suitable sealer to improve resistance to water, stains and daily use.
How thick should GFRC be?
The required thickness depends on the design, dimensions, shape, reinforcement and intended application.
Thin decorative pieces can require less thickness than a large countertop or structural element. Large projects, long spans and areas around cut-outs may require additional reinforcement or a different construction.
Always consider the complete design and application when determining the required thickness.
Is GFRC waterproof?
GFRC itself is not automatically waterproof.
Concrete is naturally porous to some degree. For applications exposed to water, stains or food, such as countertops and sinks, we recommend using a suitable concrete sealer.
The correct sealer depends on the application and desired level of protection.
Does GFRC crack?
Like all cement-based materials, concrete can crack if it is improperly designed, mixed, reinforced or cured.
The risk of cracking can be reduced by using the correct amount of reinforcement, maintaining proper curing conditions and avoiding unnecessary stress during handling and installation.
How strong is GFRC?
GFRC can provide excellent strength for decorative and architectural concrete applications.
The final strength depends on many factors, including the mix design, fibre content, water-to-cement ratio, additives, curing conditions and production method.
GFRC Mixing & Processing
How do I mix GFRC?
Always follow the instructions supplied with your specific GFRC products.
In general, accurate weighing of all ingredients is important. The mixing process should ensure that the cement, powders, additives and fibres are evenly distributed throughout the mix.
Do not add more water than recommended, as excessive water can negatively affect the strength and performance of the concrete.
Why is a superplasticizer used in GFRC?
A superplasticizer improves the workability and flow of the concrete without requiring excessive amounts of water.
This makes it possible to create a workable mix while maintaining a relatively low water-to-cement ratio.
Can I add extra water if my mix is too thick?
We generally recommend following the prescribed mixing instructions rather than simply adding extra water.
Adding too much water can reduce strength and increase shrinkage. If your mix is too thick, check the recommended dosage of water and additives before making adjustments.
Why is my GFRC mix too dry?
Possible causes include:
Always check the product instructions and accurately measure all ingredients.
Why is my GFRC mix too liquid?
A mix may become too liquid when too much water or superplasticizer has been added.
Always measure liquids accurately and avoid adding products without checking the recommended dosage.
How long can GFRC be processed after mixing?
The processing time depends on the specific products used, temperature and working conditions.
Higher temperatures can reduce working time. Always prepare your mold and tools before mixing the concrete.
What temperature is best for casting GFRC?
Moderate and stable temperatures are generally preferred.
Extremely high temperatures can accelerate the setting process and reduce working time, while very low temperatures can slow down curing.
Avoid casting in freezing conditions or exposing fresh concrete to extreme heat or direct sunlight.
Glass Fibres & Reinforcement
Why are glass fibres used in GFRC?
AR glass fibres are used to reinforce the concrete.
The fibres help improve tensile strength and reduce the risk of cracking. They also allow the concrete to be used in thinner sections compared with traditional concrete.
What does AR glass fibre mean?
AR stands for Alkali Resistant.
AR glass fibres are designed to withstand the alkaline environment of cement-based materials. This makes them suitable for use in GFRC and other cement-based composites.
Can I use regular fibreglass instead of AR glass fibres?
No. Standard fibreglass is not designed for long-term use in the highly alkaline environment of concrete.
For GFRC, we recommend using fibres specifically designed for cement-based applications, such as alkali-resistant glass fibres.
How much glass fibre should I use?
The required amount depends on the GFRC system and application.
Always follow the recommended fibre dosage for the specific mix and production method you are using.
Adding too much fibre can make the concrete difficult to mix and process.
Can I cut glass fibres shorter?
Some projects may require shorter fibres, depending on the application and desired finish.
However, changing the fibre length can affect the reinforcement properties and workability of the concrete.
Concrete Pigments
How do I colour concrete?
Concrete can be coloured using pigments that are suitable for cement-based materials.
Pigments are usually mixed into the concrete to create colour throughout the entire material.
How much pigment should I use?
The required amount depends on the desired colour intensity and the pigment used.
Always start with the recommended dosage and test the colour before producing a large project.
Why does my concrete look lighter after curing?
Concrete often changes colour as it dries and cures.
The final colour can be influenced by:
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Moisture content
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Cement colour
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Pigment dosage
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Water content
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Curing conditions
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Surface finishing
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Sealer application
For this reason, we recommend making a test sample before starting your final project.
Can I mix different pigments?
Yes, pigments can often be combined to create custom colours.
For consistent results, accurately weigh and record the amount of each pigment used.
Will concrete pigment fade?
The durability of the colour depends on the pigment type, exposure conditions and the application.
For outdoor applications, UV exposure and weather conditions can affect the appearance of the finished product over time.
Molds & Casting
What material should I use for a concrete mold?
The best mold material depends on the project.
Common materials include melamine-coated boards, coated MDF, plastic and other smooth, non-porous materials.
The mold surface strongly influences the final surface of the concrete.
How do I prevent concrete from sticking to the mold?
Use a suitable mold release product when necessary.
Always make sure the mold is clean and properly prepared before casting.
How do I make a smooth concrete surface?
A smooth mold surface is essential.
The concrete mix, casting technique and finishing process also influence the final result.
Careful mixing and proper consolidation can help reduce surface imperfections.
How can I reduce air bubbles and pinholes?
Small air bubbles and pinholes can be reduced by:
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Using the correct mix consistency
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Applying the concrete carefully
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Compacting or vibrating the concrete when appropriate
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Using the correct casting technique
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Ensuring the mold is clean and properly prepared
The exact technique depends on whether you are using a spray, hand-packed or cast GFRC system.
Can pinholes be repaired?
Yes. Small pinholes and surface imperfections can often be repaired using a suitable concrete repair mixture.
Always test the repair method on a sample first, especially when colour matching is important.
Curing & Drying
How long does GFRC need to cure?
Curing time depends on the specific products and conditions.
Concrete requires sufficient time to develop strength. Follow the curing instructions provided with your GFRC system before removing the product from the mold, finishing the surface or applying a sealer.
When can I remove GFRC from the mold?
Demolding time depends on the concrete mix, temperature, thickness and curing conditions.
Removing a product from the mold too early can increase the risk of damage or deformation.
Why is curing important?
Proper curing allows cement-based materials to develop their intended strength and durability.
If concrete dries too quickly, it may not perform as intended and the risk of surface defects or cracking can increase.
Can I speed up the curing process?
Curing should not be accelerated without considering the specific products and production method.
Excessive heat or rapid drying can negatively affect the concrete.
Always follow the curing recommendations for your GFRC system.
Sanding & Finishing
When can I sand or polish concrete?
The correct time depends on the curing stage and the desired finish.
Allow the concrete to develop sufficient strength before performing aggressive grinding or polishing.
What grit should I use for sanding concrete?
The required grit depends on the starting condition of the surface and the desired final finish.
A typical process may begin with a coarser grit to remove imperfections and gradually move towards finer grits for a smoother finish.
Always use suitable tools and abrasives designed for concrete.
Can I polish concrete to a glossy finish?
Yes. Depending on the concrete mix and finishing system, concrete can be polished to different levels of sheen.
The final result depends on the grinding and polishing process, surface density and the products used.
Concrete Sealers
Why should concrete be sealed?
Concrete is naturally porous and can absorb liquids and stains.
A suitable sealer can help protect the surface against:
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Water
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Stains
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Oil
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Food and drinks
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Daily use
The correct level of protection depends on the type of sealer and application.
What is the best sealer for a concrete countertop?
The best sealer depends on how the countertop will be used and the desired appearance.
For heavily used surfaces, choose a sealer specifically designed for concrete and suitable for countertops or similar applications.
Consider factors such as water resistance, stain resistance, heat exposure, food contact requirements and maintenance.
What is the best sealer for a concrete sink?
A concrete sink requires good resistance to water and daily use.
We recommend selecting a sealer specifically suitable for wet environments and concrete surfaces.
Always follow the application instructions carefully.
Will a concrete sealer change the colour of my concrete?
Some sealers can slightly darken or enhance the colour of concrete, while others have a more natural appearance.
Always test the sealer on a sample of the same concrete before applying it to the final project.
How many coats of concrete sealer should I apply?
The required number of coats depends on the specific sealer and application.
Always follow the manufacturer's instructions regarding coverage, drying time and the number of coats.
How long should concrete dry before applying a sealer?
The required drying or curing time depends on the concrete and sealer being used.
Concrete should generally be sufficiently cured and dry before sealing.
Always follow the instructions for both the concrete system and the sealer.
Can I apply sealer to damp concrete?
Most sealers require the concrete to meet specific moisture and curing requirements.
Applying a sealer to concrete that is too damp can negatively affect adhesion and performance.
Concrete Repairs
Can damaged concrete be repaired?
Many small cracks, chips, pinholes and surface imperfections can be repaired.
The best repair method depends on the type and size of the damage.
How do I repair small holes or pinholes?
Small holes and pinholes can often be filled using a suitable cement-based repair mixture.
For the best colour match, use the same cement and pigments as the original concrete whenever possible.
Can I repair a crack in concrete?
Small surface cracks can sometimes be repaired, depending on the cause of the crack.
However, structural or continuously moving cracks require a different approach.
It is important to identify the cause before attempting a repair.
Why is my concrete cracking?
Concrete can crack for several reasons, including:
Outdoor GFRC & Concrete
Can GFRC be used outdoors?
Yes. GFRC can be used for many outdoor applications.
However, the complete system should be suitable for the expected environmental conditions, including moisture, temperature changes and UV exposure.
Does GFRC need to be sealed outdoors?
Depending on the application, sealing can help improve resistance to water, dirt and staining.
Choose a suitable product for exterior concrete applications.
Is GFRC frost resistant?
Frost resistance depends on the complete concrete mix, production quality, curing and exposure conditions.
Outdoor concrete exposed to freeze-thaw cycles requires appropriate materials and construction.
Choosing the Right Products
Which GFRC products do I need for my project?
The required products depend on what you are making.
A typical GFRC project may require:
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Cement-based materials
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Fine aggregates or fillers
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Superplasticizer or other admixtures
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AR glass fibres
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Pigments
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Mold release products
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Sanding or polishing materials
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Concrete sealer
For a more straightforward solution, a complete GFRC package may be suitable for certain projects.
Can you help me choose the right products?
Yes. Contact us with details about your project and we will help you select suitable products.
Please include information such as:
Orders & Shipping
Do you ship throughout Europe?
Yes. Europe Concrete Shop ships products throughout Europe using reliable logistics partners.
Available shipping options and costs may vary depending on the destination and products ordered.
How long does shipping take?
Delivery times depend on the destination, product availability and selected shipping method.
You will receive relevant order and shipping information during the ordering process.
Can I place a larger order?
Yes. We can provide suitable solutions for larger orders.
Please contact us if you require larger quantities or have specific requirements.
Can I order as a business?
Yes. We supply products to both businesses and private customers.
Can I order products outside Europe?
Please contact us if you are interested in shipping outside Europe. We will review the available options for your destination and order.
Still Have Questions?
Can't find the answer you are looking for?
Our team is happy to help with questions about GFRC, decorative concrete, concrete sealers, pigments, molds and product selection.
Contact us via our contact form, WhatsApp or email and provide as much information as possible about your project. This allows us to give you the most relevant advice.
