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HALOSEAL is a non-silicone colourless waterproofer which can be used on most building substrates including brick, stone, concrete, render and roof tiles. read more
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50 years experience

For trade enquiries, please call us on 01372 743 334

We’re open 9:00am - 5:00pm Mon-Fri

HALOSEAL is a non-silicone colourless waterproofer which can be used on most building substrates including brick, stone, concrete, render and roof tiles.

HALOSEAL is based on metabolic stearate which unlike traditional waterproofers penetrate into the fabric and becomes an integral part of the substrate. The product does not change the colour or appearance of your wall or roof, neither will it give a “shiny” tint to the brick or stonework.

Over the years most building materials deteriorate and become porous. The extent of deterioration is dependent on geographical location, exposure to the elements and quality of construction. Some areas in the UK have far greater rainfall and wind than others. Eventually, weather penetration can become a major problem which can result in the following:

• Frost attack spotting of brickwork, stonework, render and roof tiles
• Erosion of mortar joints
• Efflorescence both externally and internally
• Damp patches, blown plaster and black mould growth
• Cavity fill saturation rendering it useless
• Wet walls result in excessive heat loss and increased fuel cost.

One application of HALOSEAL prevents all these problems. HALOSEAL is easy to apply by either brush or low pressure spray. The product is microporous and will allow the structure to breathe. One coat lasts 10 years providing a long term solution to rain penetration problems.

Surfaces should be sound, clean and as dry as possible, and faults/cracks in the structure should be rectified.

  1. Moss, lichen and algae growths must be treated using LICHENITE in accordance with MGC specification.
  2. Loose and friable materials should be removed by stiff bristle (not wire) brushing. DETERGENTS must not be used in washing down or other surface preparation.
  3. Protect all glazing and mask as required.  Masking tape must be removed before HALOSEAL becomes dry.  Shake container before use – DO NOT DILUTE or mix with other products. 
  4. Apply one coat of HALOSEAL liberally by brush or low pressure spray, (not airless spray), until suction/absorbency of substrate is satisfied. If applying a second coat, allow a minimum of one hour and a maximum of four hours between coats.  It is essential that the second coat is applied before the first coat is fully dried.

Application Guidance

Do NOT apply in wet or frosty weather or when there is a rise of same during drying time. 

Drying time is dependent upon temperature, humidity and absorbency of substrate, normally 6 to 12 hours.  Clean brushes and spray equipment immediately after use and remove any splashes or over-spray with white spirit.

It is recommended that on very porous surfaces a second coat of HALOSEAL be applied to ensure long-term protection.  Balcony and garden walls must be treated both sides and soldier courses/coping stones should receive two coats.

HALOSEAL may be over-painted after 4-6 weeks with BIOCHECK ALLWEATHER masonry paint.

HALOSEAL should NOT be used on painted surfaces or high density/low suction substrates such as glazed bricks, faience tiles and engineering bricks.


If you require help or assistance with your order including for special colours in Biocheck Matt or Silk Emulsions and Biocheck Allweather please contact our sales office which is open Monday to Friday 9.00 am – 5.00 pm

Telephone: 01372 743334

Email: info@mgcltd.co.uk

Fax: 01372 720856


Mould Growth Consultants Limited

Unit A3

Longmead Business Centre

Blenheim Road



KT19 9QQ


We will aim to process your order for despatch to you between 1-5 working days of confirming acceptance of your order. Consequently, even if you cancel your order shortly after placing it, it is possible that we may be unable to prevent goods you have ordered being despatched to you and you may then need to return them to us at your cost.

When you order your Goods, we will wherever possible, give you an indication of the day of delivery, normally 2-5 working days after confirming acceptance of your order.

Deliveries will be made by post/a carrier instructed by us to the address stipulated in your order. You must ensure that someone is present to accept delivery.

While a delivery date will be prearranged with you, please remember that it is generally not possible to contact the delivery driver once he has left the depot. As a signature is required on delivery, if you will not be at home to take the delivery, a signed note instructing the driver where to leave the goods is acceptable. Otherwise a re-delivery charge will be incurred.


Cancellation of Order

If you bought the Goods as a Consumer, you may cancel your order at any time before we despatch your order or before the expiry of 7 working days from the date you receive your order, not including the day you received it.

As required by the Distance Selling Regulations, details of our after-sales service and guarantees, if any, are given on our website.

If you cancel before we have sent the Goods, we will refund to you the price of the Goods and the cost of delivery, if any.


Goods returned

Our most important task is to ensure your absolute satisfaction. We will always strive to reach that target. However, we acknowledge that mistakes are made occasionally. This paragraph covers that possibility. If you are not wholly satisfied with the product, please tell us at the earliest opportunity:

  • Exactly what the fault is
  • The date, if relevant, when the fault became apparent
  • When and how you discovered the fault
  • How the fault affected your use of the Goods

To do this, it is essential that you follow the instructions below. These provisions apply in the event that you return Goods to us because you say they are faulty:

You must tell us by email message to (info@mgcltd.co.uk) or by letter to our land address at the top of this page you that you would like to return Goods, specifying exactly what Goods and when purchased, giving full details of the defect or other reason for return. We will then issue a returns note. If you send Goods to us without a returns note, we may not be able to identify sufficient details to enable us to attend to your complaint.

The Goods must be returned to us as soon as any defect is discovered.

So far as possible, Goods should be returned:

  • With both Goods and all packaging, as far as possible, in their original condition
  • Securely wrapped
  • Including our delivery slip
  • At your risk and cost.

Please see our full terms and conditions on the website