Pasco Hypercryl 363: The Best Sealant for Brick Expansion Joints
- Elaine Quitan

- Sep 3
- 6 min read
Understanding the Importance of Caulking for Brick Expansion Joints
Brick expansion joints play a very essential and important role in preventing structural damage by allowing for natural movement caused by temperature fluctuations and settling. Without the proper sealing, moisture can infiltrate these joints, leading to deterioration, mould growth, and weakening of the brickwork over time. Caulking always serves as a protective barrier that maintains the structure's integrity, ensuring long-term durability.
Using the right and proper sealant is crucial for effective joint sealing. An inadequate or low-quality silicone may crack, shrink, or fail prematurely, compromising the protection it offers. A high-performance sealant like Pasco Hypercryl 363 ensures that brick expansion joints remain sealed against moisture, weather elements, and other environmental stressors, reducing the risk of costly repairs and maintenance in the future.

What Makes Pasco Hypercryl 363 Ideal for Expansion Joint Sealing?
Key Properties of Pasco Hypercryl 363
Pasco Hypercryl 363 is a siliconised acrylic latex sealant specifically designed for superior adhesion and flexibility. This unique formulation allows it to bond effectively with masonry, concrete, and other building materials, ensuring a strong, resilient seal. One of its standout features is its excellent resistance to water, UV exposure, and weathering, making it ideal for exterior applications.
Additionally, Pasco Hypercryl 363 is paintable, low in odour, and easy to apply and tool. It has an impressive durability rating of 45 years, meaning it offers long-term protection against joint failure. With low VOC content and mildew resistance, it also contributes to a healthier indoor and outdoor environment. These qualities make it the preferred choice for construction professionals working on brick expansion joint caulking projects.
Pasco Hypercryl 363 is available in a variety of colours to seamlessly match different masonry and brick surfaces. This range of options ensures that contractors and homeowners can achieve a professional, aesthetically pleasing finish while maintaining the superior sealing performance of the product.
Hypercryl 363 White
Hypercryl 363 Off white
Hypercryl 363 Sandstone
Hypercryl 363 Fawn
Hypercryl 363 Mocca
Hypercryl 363 Grey
Hypercryl 363 Richmond Grey
Hypercryl 363 Redwood
Hypercryl 363 Brick Red
Hypercryl 363 Espresso
Hypercryl 363 Bronze
Hypercryl 363 Black
Performance in Harsh Weather Conditions
When selecting a sealant for brick expansion joints, performance in extreme weather is a key consideration. Pasco Hypercryl 363 excels in harsh conditions due to its flexibility and weather resistance. Unlike some sealants that harden and crack over time, its siliconised acrylic latex formulation ensures it remains pliable even under extreme temperature fluctuations.
In areas with heavy rainfall, the water-resistant properties of Pasco Hypercryl 363 prevent moisture infiltration, which can lead to structural damage and mould growth. Additionally, its superior UV resistance ensures that prolonged sun exposure does not degrade its performance, maintaining its elasticity and adhesion for decades. These factors make it an ideal choice for long-term expansion joint sealing in both commercial and residential masonry applications.
Why Professional Caulking is Crucial for Brick Expansion Joints
The Role of Sealants in Structural Integrity
Sealants play an essential role in preserving the structural integrity of brickwork by accommodating natural movement and preventing moisture penetration. Expansion joints allow for thermal expansion and contraction, but without proper sealing, gaps can develop, leading to potential structural issues over time.
A high-quality sealant like Pasco Hypercryl 363 acts as a buffer, absorbing movement while keeping out water and debris. This ensures the longevity of the structure, reducing the risk of cracking and degradation. Proper application by professionals further enhances durability, as they ensure the correct depth, width, and adhesion necessary for an effective seal. Investing in professional caulking with a trusted sealant safeguards brick structures from long-term damage.
Acrylic vs. Polyurethane Sealants for Masonry Applications
Acrylic and polyurethane are two of the most common sealant types used for masonry applications, each with distinct characteristics. Acrylic latex sealants, like Pasco Hypercryl 363, provide excellent adhesion, flexibility, and paintability, making them highly versatile for brick expansion joints. They are also easy to clean up with water and have a smooth, subtle finish that blends seamlessly with masonry surfaces.
Polyurethane sealants, in contrast, are known for their exceptional durability and strong adhesion to various substrates, including concrete and masonry. However, they can be more challenging to work with, requiring solvents for cleanup and often leaving a shinier finish that may not blend as naturally with brick surfaces.
Pasco Hypercryl 363 stands out because it offers the ease of tooling and cleanup of an acrylic while maintaining the flexibility and durability needed for long-lasting expansion joint sealing. It also dries with a matte finish, ensuring it blends subtly into brickwork without a glossy appearance.
Common Applications of Pasco Hypercryl 363 in Construction
Pasco Hypercryl 363 is widely used in various masonry applications due to its superior performance and reliability. One of its primary applications is in sealing brick expansion joints, where it provides a long-lasting barrier against moisture and environmental stress.
Additionally, it is used for sealing joints in pre-cast concrete panels, hollow concrete block walls, and masonry brick walls. It is also an excellent choice for perimeter sealing around doors and windows, ensuring airtight and watertight protection. Contractors favour it for both residential and commercial projects due to its easy application, strong adhesion, and impressive lifespan.
By choosing Pasco Hypercryl 363, builders and contractors can ensure that their structures remain protected from the elements, preventing costly repairs and maintenance over time. Its ability to withstand harsh weather conditions and movement makes it an indispensable solution for sealing construction joints effectively.
Ensuring Long-Lasting Results with Professional Caulking
Proper Surface Preparation for Maximum Adhesion
Achieving long-lasting results with Pasco Hypercryl 363 begins with proper surface preparation. The substrate must be clean, dry, and free of dust, grease, or old sealant residues to ensure maximum adhesion. Any loose particles should be removed using a wire brush or compressed air.
Applying a suitable primer may also enhance adhesion, particularly on porous surfaces such as masonry or concrete. Professionals ensure that the joint width and depth are appropriately measured, as an improperly filled joint may lead to premature failure. By following these best practices, contractors can achieve a durable and effective seal, maximising the lifespan of the caulked expansion joints.
Avoiding Common Sealant Failures
Sealant failures can occur due to improper application, poor surface preparation, or selecting the wrong type of caulk for the job. One of the most common failures is adhesion loss, which happens when the sealant does not bond properly to the substrate. Pasco Hypercryl 363, with its strong adhesion properties, significantly reduces this risk.
Another common issue is premature cracking or shrinking, often caused by insufficient flexibility in the sealant. Because Pasco Hypercryl 363 remains flexible over time, it accommodates structural movement without breaking. Ensuring that the right amount of sealant is applied and avoiding over-tooling are also key to preventing joint failure and ensuring long-lasting performance.
Why Contractors Trust Pasco Hypercryl 363 for Brick Expansion Joints
Meeting Industry Standards and Certifications
Pasco Hypercryl 363 meets stringent industry standards, including compliance with ASTM C-834, a recognised benchmark for acrylic latex sealants. This certification ensures that the product meets the required performance criteria for flexibility, adhesion, and weather resistance.
By choosing a certified product, contractors can be confident that Pasco Hypercryl 363 will perform as expected in demanding construction environments. Its approval for both interior and exterior applications further reinforces its reliability, making it a trusted choice for professionals in the industry.
Cost-Effectiveness and Long-Term Benefits
Investing in high-quality sealants like Pasco Hypercryl 363 leads to significant long-term savings. While cheaper alternatives may initially seem cost-effective, they often fail prematurely, requiring frequent reapplications and repairs.
Pasco Hypercryl 363’s 45-year durability ensures that joints remain sealed for decades, reducing maintenance costs. Additionally, its excellent weather resistance minimises damage caused by moisture and UV exposure. The ease of application and water clean-up also enhance cost-efficiency by reducing labour time. For contractors looking for a reliable and long-lasting masonry sealant, Pasco Hypercryl 363 proves to be a highly cost-effective solution.
Conclusion
Pasco Hypercryl 363 stands out as the best sealant for brick expansion joints due to its superior adhesion, flexibility, and weather resistance. Its unique siliconised acrylic latex formula ensures long-term durability, making it a trusted choice for construction professionals.
By preventing moisture infiltration and accommodating structural movement, Pasco Hypercryl 363 enhances the longevity of brickwork and minimises the need for costly repairs. Contractors prefer it for its ease of application, industry certification, and impressive 45-year lifespan.
For those seeking a high-performance, professional-grade masonry sealant, Pasco Hypercryl 363 is the ideal choice. Its proven reliability and cost-effectiveness make it the ultimate solution for sealing brick expansion joints effectively.




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