GM 4004 is a water-thinnable, solventless emulsion,
based on a mixture of silane and siloxane.
Dilute solutions of GM 4004 serve as highquality,
general-purpose water repellents for hydrophobic
impregnating and priming mineral surfaces. Mineral
substrates treated with GM 4004 are especially
characterized by an excellent beading effect.
Moreover GM 4004 can be used for the mass
hydrophobation of non-load bearing concrete products.
GM4004 emulsion contains a stabilized mixture of
silanes and siloxanes that are susceptible to hydrolysis.
Hydrolysis occurs only after application to the substrate,
which breaks the emulsion. Alcohol is released and the
emulsion is converted into a silicone resin water
GM 4004 reduces the capillary absorption of the
building which it has penetrated, but does not clog
pores or capillaries. There is therefore little or no
impairment of the building material´s ability to
- good depth of penetration
- rapid development of water repellency
- highly durable and effective beading effect
- tack-free drying
- provides good adhesion for paints
- water-based and environmentally compatible
- stable in storage, even when diluted
GM 4004 is an excellent water repellent for many
absorbent mineral substrates, such as bricks, sand-lime
brick, natural sandstone and mineral plasters. It is not
so suitable for less absorbent, dense natural stone, especially limestone,
marble and reinforced concrete for bridges and roads.
Owing to its aqueous consistency and storage stability
when diluted, GM 4004 is ideal for inplant impregnation
of building materials made of clay, aerated concrete,
sand-lime brick, fibrous cement, mineral fibers and
GM 4004 may also serve as a water-repellent primer for
emulsion paints and plasters, silicone resin emulsion
paints and silicone resin plasters.
Processing as a Hydrophobic Impregnating Agent:
Tap water is suitable for preparing solutions of GM 4004
for use as facade water repellent primer. We recommend
an active substance content of 5-10% (dilute the product
in the ratio 1:4 to 1:9), the exact figure depending on
how absorbent the substrate is.
Apply the ready-to-use solution in the usual way;
flooding is the preferred way. Two “wet on wet” coats
are needed to ensure complete coverage. If it starts to
rain, stop treatment and cover the impregnated areas.
Processing as a Concrete Admixture (Water Resisting
The recommended admixture range of a 1 : 4 dilution of
GM 4004 is 1.0 % to 5.0 % of the cement content. A
significant reduction in water uptake can already be
achieved at a concentration of 1.0 % of the cement. GM
4004 is added either simultaneously with or immediately
after the mixing water – it should never be added along
with other additives.
To keep a constant w/c value the
total mixing water is reduced by amount required earlier
for dilution. We recommend testing compatibility with
other concrete admixtures separately. A longer mixing
time will thoroughly distribute the product within the
overall system, which in turn will make it highly effective.
When used in concrete goods or similar concrete
products according to EN 1338, 1339 or EN 1340, an
initial-type test (cf. section 6.2 of the respective
Graffiti Magic GM 4004 Water Repellant
MASONRY WATER REPELLENT Technical data sheet for GM 4004 / Version: 1.6 / Date of last alteration: 06.11.2014 2 / 2
standard) is recommended.