Seals concrete
ponds
G4 Pond Seal is a moisture cured
polyurethane which forms a non-porous
seal on concrete rendered ponds,
G4 uses the moisture in the
air and the render to harden,
it can be applied to slightly
damp surfaces, but it is important
that the render is sufficiently
dry to be porous so as to enable
the first coat of G4 to bond
and obtain a mechanical grip,G4
can be applied in poor weather
conditions, high humidity and
at temperatures down to zero
degree's.
Construction Materials
As a general rule the pond should
be constructed to be structurally
sound since the G4 only provides
the waterproof seal, on no account
use a P.V.A based sealer to
seal or prime any surfaces,
these materials can contain
ammonia and also stop the G4
from adhering to the render.
Ponds will normally be constructed
with either brick, lightweight
block or concrete block and
then rendered, it is not necessary
to add waterproofing agents
to the render mix as this will
increase the density of the
render and can inhibit penetration,
if a waterproofing agent has
been used, simply rub down the
surface with an abrasive to
obtain a key.
If a fibre is used to give
strength to the render it is
necessary to burn off or sand
down any fibres that are on
the surface, as any fibres that
protrude will cause leakage,
G4 will not bond to the fibres.
The cement render should be
trowelled to an even surface
but not to a smooth dense plaster
like finish since this prevents
the penetration of G4, new render
should be kept damp for the
first three days and then allowed
to harden for 21-28 days depending
on conditions.
Method of application
Apply the first coat by brush,
a roller can be used but it
is necessary to avoid puddling
of the G4 on the base, it is
best to use a brush, allow the
first coat to become finger
tacky ( like cellotape ) or
dry enough to walk upon carefully,
approximately 45-60 minutes
depending on humidity, then
apply 2nd coat, when second
coat is finger tacky apply third
coat, no longer than 4 hours
should pass between coats, if
a colour is used, then use 2
coats of standard and 2 coats
of colour, G4 is mechanically
hard after 24 hours but must
be given 72 hours to chemically
cure, after which the pond can
be washed down with plenty of
water, drained, and can then
be filled.
Usage
- G4 Standard - 3 coats =
550g per sqm for the three
coats
- G4 Coloured - 2 coats of
standard = 410g per sqm for
2 coats and 2 coats of colour
= 400g per sqm for 2 coats
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