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- At some point all Do It Yourselfers will
encounter some damage to a plastered surface. The following
notes will enable you to produce a good repair.
- Using a hammer and chisel, cut away the
plaster around the damaged area into the shape of a square or
rectangle making sure that the cuts are sloping backwards
against the old plaster. This will help to stop the new plaster
falling out.
- Brush away all the dust or remove with a
vacuum cleaner and nozzle attachment.
- Dampen the area prior to plastering using a
brush and water or spray bottle if you have one.
- Always add plaster to water in a bucket. Not
water to plaster. Mix thoroughly using a paddle attachment with
an electric drill (start slowly and increase speed gradually) or
a stick or gauging trowel for small quantities.
- Use Bonding Coat plaster to fill up the area
leaving it proud of the old plaster. Remove the excess plaster
by scraping away with a straight edged stick or plastering
trowel (if larger than the repair area) using the old plaster as
a guide. Before the plaster sets the surface needs to be lightly
scraped back to accommodate 2mm of finishing plaster.
- When the Bonding plaster has set (usually
minimum 2 hours depending on ambient temperature), mix a
quantity of finishing plaster and coat up the patch with the
first coat. The second coat should be applied after about 10
minutes. Don't try to get the plaster smooth at this point as
you must wait until the plaster becomes less soft in order to
flatten out any lines or marks. Keep the perimeter of the patch
damp using a brush and water to wet down the old adjacent
plaster.
- After flattening out (this should not require
a lot of pressure), clean your tools while waiting to trowel up
(method below). The time to trowel up is just as the plaster
starts to develop small dark areas ( this means the setting
process is starting).
- Trowel up using a brush and minimal amount of
water. Lightly brush the area with water. If the water is
running down the wall, then you're using too much. Trowel over
the area and remove excess plaster "fat". Using clean water,
carefully brush the old plaster around the new patch to remove
excess smears.
- Quantities. A 25 Kg bag of Bonding plaster
when mixed with water will cover an area of approx 3 square
metres at 10mm thickness. A 25 Kg bag of finishing plaster when
mixed with water (about 10 Litres per 25 Kg bag) will cover an
area of approx 10 square metres.
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