Adheseal Showerseal Sealer

For leaking showers, balconies, and tiled wet areas where lifting tiles is not an option, Showerseal Sealer penetrative treatment seals porous substrates from within. This clear siloxane/silane solution penetrates deep below the surface to create an internal hydrophobic barrier, stopping water ingress and reducing efflorescence without altering the original appearance or gloss of the tiles and grout.

How it works

The siloxane/silane chemistry works by lining the internal pores of the substrate rather than forming a surface film. This subsurface barrier resists high pH conditions, making it compatible with new concrete, sand and cement beds, and lime-based mortars. Because it does not block the pores completely, the treated substrate retains its breathing ability, allowing moisture vapour to diffuse out of the structure. On glazed tiled areas, the liquid penetrates exclusively through the porous grout lines.

Numbers that matter

• 5m² per litre — General coverage rate on porous substrates, which will vary based on surface texture and porosity.
• 250ml to 500ml per shower — The standard volume required to treat a typical tiled shower recess, applied in 3 soaking coats.
• 48 hours before / 24 hours after — The critical dry-out and cure window. The shower must remain dry for 48 hours before application to allow maximum penetration, and must not be used for at least 24 hours after the final coat.
• 5°C to 30°C — The permissible application temperature range to ensure proper penetration and curing.

Where to use it

Showerseal Sealer is suitable for porous substrates, including:

• Tiled showers, wet areas, and laundries.
• External tiled decks, balconies, and terraces.
• Concrete, brick, masonry, block walls, and stone.
• Fiber cement sheeting (FC sheeting), render, and sandstone.
• Painted surfaces (preliminary adhesion testing is suggested).

Limitations

• No crack bridging: Showerseal Sealer cannot bridge cracks or fill voids. All loose or cracked grout and mortar must be replaced and allowed to dry before application.
• Low density substrates: Not suitable for highly porous, sandy, or friable surfaces, as they do not allow the solution to build up an adequate water barrier.
• Glass and glazing: Liquid must be wiped off glazed surfaces or glass immediately during application to prevent surface etching.
• Concrete curing: New concrete must cure for a minimum of 28 days before treatment to prevent poor penetration.
• Sealant compatibility: Existing joint sealants must be removed prior to application and replaced with a compatible Adheseal sealant only after the treatment has fully dried.

Installation and drying

Surfaces must be structurally sound, dry, clean, and free of dust, oils, grease, curing compounds, surface water, or continual dampness. Apply Showerseal Sealer by brush, roller, or spray, ensuring the substrate is thoroughly saturated. For walls, start spraying at the top and work down to allow the liquid to run evenly and saturate the surface. At 25°C and 50% Relative Humidity, individual coats are touch dry in 2 to 4 hours and set in 4 to 8 hours. Full cure is achieved 24 to 48 hours after the final coat is applied.