Alpha Chem Solvent External Water Seal 25 Litre Repellent Sealer MXW-601

Alpha Chem Cromar Solvent External Water Seal High Performance Repellent Sealer MXW-601

Barcode: 5036684000093

MPN: MXW/601

Size: 25 Litre Trade Size

Colour: Clear

Overview:

Alpha Chem Solvent External Water Seal is a high performance, solvent-based water repellent supplied in a 25 litre trade drum. It is specially formulated to give a transparent, breathable and long-lasting water-resistant finish on many porous exterior surfaces, including masonry, brick, render, concrete, pebble dash and previously treated exterior timber.

The micro-porous clear treatment penetrates deeply into the substrate, chemically bonding to create durable water beading that helps protect against rain penetration and weathering. It is ideal for large scale trade projects and maintenance work where long-term water repellence is required.

Key Features

• Trade size 25 litre drum for larger projects and ongoing site use

• Solvent-based, clear water repellent for exterior porous surfaces

• Deep penetrating formula for long-lasting water resistance and beading

• Chemically bonds to the surface and is unaffected by UV light

• Suitable for masonry, brick, render, concrete, pebble dash and exterior wood (pre-treated with preservative)

• Quick drying solvent-based formulation for efficient application

• Applied by brush, roller or suitable low-pressure spray equipment

• Helps reduce water ingress, staining and weather-related deterioration

Specifications

• Brand: Alpha Chem / Cromar

• Product Name: Solvent External Water Seal High Performance Repellent Sealer

• MPN: MXW/601

• Barcode: 5036684000093

• Trade Size: 25 Litre drum

• Base: Solvent-based, clear water repellent

• Finish: Transparent, micro-porous water shedding surface

• Suitable Substrates: Masonry, brick, stone (not natural stone), render, concrete, pebble dashing, exterior wood previously treated with preservative

• Application Methods: Brush, roller or low-pressure spray (coarse nozzle)

• Coverage (Guide): Approx. 2–4 m² per litre per coat (porosity dependent)

• Use Location: Exterior only

• Over-Painting: Not suitable for over-painting; final treatment coat

can be applied by spray, brush, or roller a Application Kits Available 9 inch Single Arm Application Kit or 12 inch Double Arm Application Kit

Applications

• Water repellent treatment for exterior brickwork and blockwork

• Sealing rendered walls, concrete and pebble-dashed surfaces

• Protecting masonry from driven rain and surface water penetration

• Enhancing water beading on exterior wood previously treated with preservative

• Trade and maintenance use on houses, outbuildings and commercial facades

• Large scale sealing jobs where a clear, breathable water repellent is required

Also Available Alpha Chem Solvent Water Seal in 5 Litre 

How to Use

• Ensure surfaces are sound, dry, clean and free from dirt, dust, oil, grease and organic growth before application.

• Do not apply for 2–3 days after rain; the substrate must be sufficiently dry to allow good penetration.

• Shake the container well before use; the product is supplied ready-to-use and must not be diluted.

• Apply liberally by soft-bristled brush, roller or low-pressure spray using a coarse nozzle to avoid misting.

• Treat from the top of the surface working downwards, ensuring complete, even coverage and allowing run-down to wet the area below.

• On masonry a single generous coat is usually sufficient; on porous surfaces a second coat may be applied once the first has dried.

• On exterior wood, apply two coats as required. Mask windows and glazed areas and wipe any splashes immediately with white spirit.

• Clean all tools and equipment with white spirit immediately after use.

Alpha Chem Solvent External Water Seal 25L – Key FAQs

• What surfaces can this water seal be used on?
  It is suitable for exterior masonry, brick, render, concrete, pebble dash and exterior timber previously treated with preservative. It must not be used on natural stone.

• Can I paint over this water seal after application?
  No, this product cannot be over-painted and should be used as a final treatment. It may affect adhesion of subsequent coatings and is not intended as a paintable base.

• How many coats are normally required?
  Most masonry surfaces only need one liberal coat. Very porous surfaces may benefit from a second coat once the first has dried. Exterior wood generally requires two coats.

• How much coverage will I get from 25 litres?
  Coverage depends on porosity. As a guide, 2–4 m² per litre per coat is typical, so a 25L drum may cover approximately 50–100 m² per coat.

• Can I apply it soon after rain or on damp walls?
  No, do not apply within 2–3 days of rainfall or onto wet substrates. Surfaces must be dry enough to allow proper penetration for effective water repellence.

• How should I deal with windows and other smooth surfaces?
  Mask off windows, glazed areas and any surfaces that should not be treated. If splashes occur, wipe them away immediately using white spirit.

Please note:

Tins and drums may become dented in transit. This cosmetic damage is not a reason for return please do not purchase tinned products if minor denting is an issue for you.