Sika Water Sealer Masonry Repellent 5L 880435

Sika Water Sealer 5L

MPN: 880435 | Barcode: 5029347004255

Sika Water Sealer 5L is a transparent masonry water repellent designed to reduce water penetration on mineral surfaces such as brick, stone, render and pebble dash. It penetrates into porous surfaces to help protect against rain ingress while allowing moisture vapour to evaporate.

The solvent-free silicone resin formula dries clear and provides invisible protection without significantly changing the appearance of the treated surface. It is suitable for contractors, property maintenance users and DIY applications where external masonry requires water resistance and weather protection.

This 5L size is suitable for smaller exterior protection jobs, maintenance work and targeted treatment areas compared with larger 25L drums used for bigger commercial or high-coverage projects.

What This Product Is Used For

This water sealer is used as a final protective treatment for porous external masonry surfaces exposed to rain and weathering.

• Protecting brickwork from rain penetration.
• Treating stone walls and masonry features.
• Sealing render and pebble dash surfaces.
• Reducing water absorption on porous mineral substrates.

Key Performance Benefits

• Invisible Protection: Dries clear while helping resist rain penetration.
• Water Beading Effect: Reduces water absorption so rain beads on the surface.
• Solvent-Free Formula: Non-flammable and suitable for external masonry use.
• Breathable Finish: Allows moisture vapour to evaporate from the treated surface.

Why Choose This Water Sealer

This water sealer is selected when masonry needs protection from rain penetration without applying a visible coating. It is suitable for porous brick, stone, render and pebble dash where the surface must remain breathable.

Compared with traditional solvent-based water repellents, this silicone resin formula is solvent-free, non-flammable and UV resistant, while still providing effective water beading and external weather protection.

How It Fits Into The Job

This product is used after cleaning and preparing the surface:

• Step 1: Clean the surface and remove dirt, algae, grease and loose material.
• Step 2: Apply the water sealer evenly by brush, roller or low-pressure garden spray.
• Step 3: Apply a second coat while the first coat remains damp, then allow the surface to dry.

Quick Use Guide

Shake well before use and apply only to clean, sound and porous surfaces. Do not dilute.

• Preparation: Ensure the surface is clean, sound and free from contamination.
• Application: Apply from the bottom upwards using a brush, roller or low-pressure garden spray.
• Second Coat: Apply within 1 hour while the first coat is still damp.
• Drying: Allow approximately 1 to 2 hours drying time depending on conditions.

Compatible Products

This product is commonly used with a mortar and cement cleaner for surface preparation and a 9 inch sealer application kit for applying the water repellent evenly across masonry surfaces.

• Specification

  Weight	5.6 kg
  Reference Code	WAT5
  Colour	Clear
  Size	5 lItre
  Manufacturer	Sika
  Type	Masonry concrete Water Sealer Repellent
  Reference Code sika	880435

• Product FAQs

  Q: What is Sika Water Sealer used for?
  A: It is used to protect masonry surfaces such as brick, stone, concrete and render from water penetration and weather damage.
  Q: Will this product change the appearance of the surface?
  A: No, it dries clear and provides invisible protection without significantly altering the look or texture of the surface.
  Q: Can it be applied to damp surfaces?
  A: Yes, it can be applied to slightly damp surfaces, but they must be clean and free from contaminants before application.
  Q: How does it protect against water?
  A: It penetrates into the surface and creates a breathable barrier that causes water to bead and run off while allowing moisture vapour to escape.
  Q: How many coats are required?
  A: Most surfaces require two coats, with the second coat applied while the first is still damp for best results.
  Q: Is this suitable for all surfaces?
  A: It is suitable for porous mineral surfaces only and should not be used on non-porous materials, painted surfaces, wood or plastic.

• Downloads

  Sika Water Sealer Technical Data Sheet
  Sika Water Sealer Sealer Safety Data Sheet