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Setseal 1 is a highly effective and easily dispersed waterrepelling additive for sand /cement renders and screeds.

The product is an aqueous dispersion of inorganic silicates. It is diluted with water before use and provides permanent waterproofing and reduced permeability of cement bound mixes throughout their entire mass.


The benefits of using Setseal 1 also include better resistance to chemical attack, increased frost resistance, and reduced efflorescence, all with no reduction in the strength. Setseal 1 may be used with Portland cement (ordinary and rapid hardening) and sulphate resisting cement.

Setseal 1 renders are applied in two, three or four coats depending on the water pressures involved and the type of structure. 

Setseal 1 has also been used extensively for the waterproofing of basements, boiler houses, lift shafts, floors, retaining walls, swimming pools and water storage tanks.

Materials Supplied

20 and 200 litre containers. 


Protect from frost and store under dry warehouse conditions at a temperature between 10°C and 30°C.

Shelf Life

12 months in unopened, undamaged, sealed containers and stored under good conditions.

Application Instructions


Prior to application, all leaks and water jets must be stopped.

Substrates should be mechanically prepared by bush hammering, grit blasting etc, to produce a clean exposed aggregate finish, free from dust, oil, grease, paint, laitance, etc., in order to provide a ‘key’ for the Setseal 1 enhanced mortar.

The prepared substrate should be thoroughly dampened with clean water to minimise suction, ensuring there is no surface water present prior to application.


For all applications it is necessary to dilute one part Setseal 1 with 10 parts clean water before use and to mix well to ensure it is uniformly dispersed. The cement : sand ratios supplied are by volume. The sand should be washed well-graded sharp sand, a maximum 3mm for the wall renders and a maximum 4.75mm for the main floor coat.


All equipment should be cleaned with water immediately after use.


Setseal 1 screeds and renders are cement-based products and in common with all such materials must be cured in accordance with good concrete practice. Wet hessian combined with polythene sheeting is recommended to prevent rapid drying, for a minimum of 7 days.


Successive coats of mortar should be keyed in with a splatter coat rather than scratching the surface. This avoids possible damage which could lead to water penetration.

Do not place when the substrate temperature is below 10°C or when the ambient temperature is 10°C and falling. Protect from frost.

The use of a well-graded sharp sand is essential to forming good waterproof renders and screeds. Soft sand is not satisfactory and maximum size should be 3mm for renders and 5mm for screeds.


Consult the appropriate Material Safety Data Sheets prior to using Setseal 1.

This data sheet is for general guidance purposes only and may contain information that is inappropriate for certain conditions of use. Accordingly, all recommendations and suggestions are made without guarantee. Further information is available from our Technical Department.

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Don Construction Products Ltd.

Hawthorn House, Helions Bumpstead Road,
Haverhill, Suffolk, CB9 7AA, United Kingdom
Tel: +44 (0) 1440 766360 
Fax: +44 (0) 1440 768897

Email: info@dcp-int.co.uk
Email: stephen.bird@dcp-int.com
Email: tom.emery@dcp-int.com