Adhesives & Sealants

Premium adhesives and sealants engineered for secure bonding and seamless waterproofing in even the toughest conditions.

Adhesives & Sealants
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Common Trade Questions

Application, Curing & Best Practice 📢

A sealant is designed to remain flexible, filling gaps or joints while accommodating movement. An adhesive provides a rigid bond between materials where movement is minimal. Hybrids can perform both roles, but choosing the right product depends on the application — use flexible sealants for expansion joints and structural adhesives for permanent bonding or fixing.

Hybrid sealants combine the UV stability of silicones with the strength of polyurethanes. They’re paintable, low-odour, and better suited for external joints exposed to weathering. PU sealants still excel in high-movement, trafficable, or submerged areas, but hybrids are now the preferred option for general construction and waterproofing detailing because they don’t yellow or crack under sunlight.

While some trades occasionally use non-slumping hybrid or PU sealants to create small fillets in confined areas, the standard and recommended practice is to use a cementitious repair or fillet mortar such as Mapegrout T40. Mortar-based fillets form a rigid, shape-stable radius that allows for even membrane coverage and consistent performance.

Most hybrids and PU sealants form a surface skin within 10–30 minutes and reach full cure within 24–72 hours, depending on humidity, temperature, and joint depth. Always check the manufacturer’s data — thicker applications and low humidity significantly slow the cure process. Premature exposure to moisture or movement can cause surface blistering or incomplete bonding.

Hybrid sealants are typically paintable with water-based coatings once fully cured. PU sealants can also be painted, but flexible or elastomeric paints yield the best results. Avoid solvent-borne coatings that soften or discolour the sealant. Always test a small area first — paint adhesion varies with formulation and surface type.

Failure often results from poor surface preparation, movement beyond design limits, or incompatible substrates. Surfaces must be clean, dry, and free from oils, laitance, or dust. Use a primer when specified — especially on porous or powdery surfaces. Overstretching due to incorrect joint sizing or backer rod omission is another common cause of failure.

Use UV-stable hybrid or high-performance PU sealants for waterproofing terminations, flashing joints, and pipe penetrations. Soudal T-Rex Power Sealant and Multibond SMX35 are ideal for most detailing applications. Avoid silicone in membrane systems unless explicitly tested for adhesion — silicone can inhibit subsequent membrane bonding.

A sealant should always bond to two sides only, not the base of the joint — achieved using a backing rod or bond breaker tape. This allows the sealant to flex properly under movement. The ideal width-to-depth ratio is roughly 2:1 for most construction joints. Overfilling or bonding to three sides transfers stress directly into the sealant, leading to tearing or edge failure.

Only specialised moisture-curing PU or hybrid sealants are suitable for these environments. Standard construction sealants aren’t designed for immersion. Always confirm the product’s suitability — even within the same chemistry family, performance varies widely between brands and formulations.