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Paint Additive for Water Based Paints


Dura-add is a solvent less, water-thin-able emulsion of a polysiloxane modified with functional silicone resin.


Dura-add is an additive used in the manufacture of aqueous masonry coatings and aqueous primers to enhance water repellency, water resistance and water-vapor permeability. It also improves the process ability and antilock characteristics of the aqueous coatings.


Silicone resin emulsion paint and silicone resin plasters
Silicate emulsion paints and plasters
Highly filled emulsion coatings
Whitewash emulsions
Interior paints
Reinforcing stoppers
Aqueous facade primers
Insulating materials


Dura-add may be added undiluted to aqueous masonry coatings and primers either during after manufacture. We recommend adding 1 wt % to masonry coatings and 5 wt % to primers.
Dura-add may also be thinned with water for use a water-repellent primer on material substrates and as a water repellent for in-plant manufactured insulation materials.
Dura-add can also serves as a water-repellent primer, in which case it should be diluted 1: 9 parts by weight with water. When such primers are required to strengthen the substrate, we recommend adding polymer dispersion in hydrosol form. For the impregnation of insulating materials, we recommend diluting Dura-add with water in the ratio 1: 100 to1: 200 parts by weight.

Product Data

Typical Value
milky, white
Solid content,
approx. [wt %] 55
Density at 25 °C,
approx. [g/cm3] 0.99
approx. 7


Dura-add has a shelf life of at least 9 months when stored between 0 °C and 30 °C in the tightly closed original container. The ‘Best use before end’ date of each batch appears on the product label.
If the material is kept beyond the shelf life recommended on the product label it is not necessarily unusable, but a quality control should be performed on the properties relevant to the application.


Material Safety Data Sheets are available upon request, Formulations typically remain stable and suitable for application for six moths, if stored over longer period the formulation may Detailed safety information is contained in each material data safety sheet, which can be obtained from our sales offices. separate. In this case, the formulation must be vigorously stirred before application.