Ardex WPM 300 is a two-part water
based epoxy coating designed as a preparatory sealer and barrier coat.
HydrEpoxy WPM 300 prepares otherwise incompatible or problem surfaces prior to
the application of surface coatings such as paint, texture coatings and
waterproofing membranes.
Ardex WPM 300 effectively safeguards the final finish
from being adversely affected by moisture and prevents problems such as:
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Blistering of paint and texture coating finishes
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Poor top coat adhesion
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Drummy render
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Poor masonry bonding
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Efflorescence
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Crumbling substrates HydrEpoxy WPM 300 also enables
new/green concrete or render to be top coated with minimum delay
Sealing Against Efflorescence
PREVENTING SALTS
Efflorescence is the migration of salts from concrete,
bricks, masonry and pavers that either form a powder or crystallise on the
surface. These salts will migrate through tile adhesives, paint and texture
coatings causing discolouration and in severe cases can result in the total
breakdown of the applied top coating. This effect is exacerbated when the
substrate is not totally dry before application of the top coating. HydrEpoxy
WPM 300 can be used to prevent the effect of efflorescence forming on the surface
of paint, texture, tiles and other coatings.
TO PREVENT IT
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Remove any coatings, dirt and loose salts from the
substrate.
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Apply one coat of HydrEpoxy WPM 300 by brush or roller,
at a coverage rate of 3 square metres per litre.
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Allow HydrEpoxy WPM 300 to dry overnight.
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Apply desired top coatings.
Bonding New To Old Concrete or Render
A BETTER FOUNDATION When applying new concrete or render
onto aged concrete it is very important that a sound, firm bond is achieved
between the two materials. HydrEpoxy WPM 300 forms a structural high strength
bond between new concrete/render and aged concrete. Use of HydrEpoxy WPM 300
eliminates the risk of ending up with drummy render or poorly bonded concrete.
TO FIX IT
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Remove any coatings, dirt and loose material from the
substrate.
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Apply one coat of HydrEpoxy WPM 300 at a coverage rate of
3 square metres per litre.
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Whilst the HydrEpoxy WPM 300 is still wet and tacky, lay
the new render or concrete topping.
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Should the HydrEpoxy WPM 300 go hard before the render/concrete
can be laid simply apply a further coat of HydrEpoxy WPM 300 and apply top
coating.
Internal Sealing Of Subterranean Surfaces
RESISTING HYDROSTATIC PRESSURE
A common problem with walls and floors that are
effectively underground or have earth back-fill against the external surface is
that they range from being always damp to water seeping through them. The water
develops a pressure against the external surface equal to the height of the
back-fill or the depth the wall is underground. This pressure is referred to as
a head of water and forces water through the wall. In many areas of Australia
the water table is very high resulting in water seeping through the floor due
to capillary action.
TO FIX IT
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Apply HydrEpoxy WPM 300 directly onto the internal wall
substrate, which must be clean and free from any dirt and surface coating.
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HydrEpoxy WPM 300 should be applied in 2 coats at a
maximum coverage rate of 3 square metres per litre per coat to seal off water
against hydrostatic pressure of up to 25-metre head of water.
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Allow to cure for 2 days (48 hours) before applying
desired top coating to wall or floor.
New (Green/fresh) Concrete Or Render
WHY WAIT AROUND?
Normal practice is to allow new concrete to cure for 28
days and render for 7 days, before the application of surface coatings such as
paint, texture coatings, levelling compunds and waterproofing membranes. With
HydrEpoxy WPM 300 these coatings can be applied to new concrete/render so long
as the latter is hard enough to coat (generally after 16 hours). In fact
HydrEpoxy WPM 300 offers the benefit of acting as an effective concrete curing
membrane, which means less risk of cracking, shrinkage and optimum strength of
the finished concrete.
TO FIX IT
Clear the surface of dust and other contaminants.
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Apply 1 coat of HydrEpoxy WPM 300 by brush or roller at a
coverage rate of 3 square metres per litre.
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Allow HydrEpoxy WPM 300 to dry overnight.
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Apply surface top coating such as paint, texture
coatings, waterproofing membranes, levelling compunds, tile adhesives etc. NB:
HydrEpoxy WPM 300 is a surface preparation product and must not be left exposed
to UV rays for extended periods.
Wet Concrete Or Render
RENOVATORS TAKE NOTE When renovating bathrooms, or other
internal wet areas, the underlying substrate is usually wet and at times
saturated. Applying a top coating to such a substrate causes blistering, drying
and/or adhesion problems, which can ultimately lead to a breakdown of the applied
top coating. An option is to wait for the substrate to dry, resulting in
expensive delays especially in a fast track commercial project situation.
Similar problems can be experienced when applying paints or texture coatings in
external applications.
TO FIX IT
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Remove all surface water.
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Apply one coat of HydrEpoxy WPM 300 by brush or roller at
a coverage of 3 square metres per litre. Allow HydrEpoxy WPM 300 to dry
overnight.
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Apply desired top coating eg. paint texture coatings,
waterproofing membranes etc.
Sealing Rising Damp
THE BLIGHT OF MANY AN OLD HOUSE
Rising damp caused by
moisture from the ground coming through brick and masonry walls, results in
major problems when tiling, painting or wallpapering. Rising damp manifests
through blistering paint, crumbling plaster etc. Once rising damp is addressed
through fixing the damp course the substrate is coated with HydrEpoxy WPM 300
before the surface is painted, tiled or wallpapered. HydrEpoxy WPM 300 can be
applied to concrete, render, bricks, stone or other solid substrates. HydrEpoxy
WPM 300 is not recommended for use over plaster, gyprock or over concrete walls
with reinforced steel. For areas subject to hydrostatic pressure when wall is
below ground level refer to section "Internal Sealing of Subterranean
Surfaces".
TO FIX IT
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Fix the damp course.
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Remove existing coatings to ensure proper bonding of
HydrEpoxy WPM 300 to the substrate.
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Apply one coat of HydrEpoxy WPM 300 by brush or
roller at a coverage rate of 3 square metres per litre and allow to dry
overnight then apply top coating. NB: Do not treat both sides of a wall with
HydrEpoxy WPM 300, as moisture must be allowed to escape.
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