Choosing the Right Waterproof Sealant Mastic for Your Project

When it comes to protecting joints and surfaces from moisture damage, selecting the right waterproof sealant mastic is essential. Whether you’re working on a commercial build, a domestic repair, or a specialist installation, a high-quality mastic sealant ensures durability, flexibility, and long-lasting results in even the most challenging environments.

At SSL, we supply a comprehensive range of premium waterproof sealant mastic products to suit all applications. From construction and glazing to roofing and marine settings, we understand that not all projects are the same – which is why we stock trusted, high-performance solutions like CT1 Sealant and Adhesive, Arbo Arbomeric MP20, and Soudal Aquafix – All Weather Sealant.

What is Waterproof Sealant Mastic?

Waterproof sealant mastic is a flexible material used to fill and seal joints, cracks, and gaps, preventing the ingress of water, air, and other environmental contaminants. It is ideal for applications where water resistance is crucial – such as bathrooms, kitchens, windows, roofing, cladding, and external walls.

Unlike ordinary sealants, waterproof mastic is designed to withstand exposure to moisture over time without degrading, shrinking, or losing adhesion.

CT1 Sealant and Adhesive – The All-in-One Solution

One of our best-selling products, CT1 Sealant and Adhesive, is a versatile hybrid polymer solution known for its exceptional bonding strength and waterproof properties. CT1 adheres to almost any surface – even when wet – and is ideal for both sealing and bonding tasks.

Its advanced formulation makes it resistant to mould, chemicals, and UV exposure, making it perfect for bathrooms, kitchens, and even marine applications. CT1 is also odourless and solvent-free, making it a safer and more environmentally friendly choice.

Arbo Arbomeric MP20 – The Contractor’s Favourite

Arbo Arbomeric MP20 is a high-performance, one-part polyurethane sealant that offers excellent weather resistance and elasticity. Commonly used in construction and glazing, this mastic sealant is highly durable and provides a long-lasting watertight seal.

MP20 adheres strongly to a wide range of substrates including aluminium, concrete, wood, and brickwork. It’s particularly suitable for external expansion joints and perimeter sealing around windows and doors.

Soudal Aquafix – All Weather Sealant for Every Condition

When you need a sealant that performs in all weather conditions, Soudal Aquafix – All Weather Sealant is the go-to product. This ready-to-use, bitumen-based mastic is ideal for emergency roof repairs, gutter sealing, and exterior maintenance – even in damp or rainy conditions.

Aquafix can be applied in wet conditions and adheres to most building materials, including roofing felt, metal, glass, and concrete. It’s an essential addition to any toolbox, particularly for outdoor and winter works.

Need Expert Advice?

If you’re unsure which waterproof sealant mastic is right for your project, our knowledgeable team is always here to help. We’re committed to supplying only the best sealants on the market, ensuring you get a reliable, watertight finish every time.

Explore our full range online or contact us directly for tailored product recommendations.