- Surface Preparation
Coating integrity and
service life will be reduced because of improperly prepared surfaces.
Up to 80% of all coatings failures can be directly attributed to
inadequate surface preparation that affects coating adhesion. Selection
and implementation of proper surface preparation ensures coating
adhesion to the substrate and prolongs the service life of the coating
Selection of the proper
method of surface preparation depends on:
the substrate, the environment, and the expected service life of
the coating system. Economics, surface contamination, and the effect
on the substrate will also influence the selection of surface preparation
No exterior painting
should be done immediately after a rain, during foggy weather, when
rain is predicted, or when the temperature is below 10°C (50°F).
Sound preparation is essential to good-looking, long-lasting results.
A properly prepared surface should be clean, solid, dull, dry, and
patched or caulked. Peeling or flaking paint must be removed by
using a paint scraper, wire brush, sandpaper, or powerwasher. Remove
any mildew present.
Surfaces that have not
been previously painted or that are exposed down to the original
surface should be handled as follows:
WOOD COMPOSITION BOARD, OR HARDBOARD:
These surfaces must be primed with an exterior wood primer. After
priming, caulk nail heads, holes, and siding joints, as well as
around window and door frames. Prime bare plywood with a Latex Primer
and let dry. Prime other woods with an Oil Primer.
Allow new mortar to cure at least 30 days. If a smooth surface is
desired, apply a Block Filler following label directions.
CONCRETE, STUCCO/MASONRY, AND CEMENT COMPOSITION BOARD:
These surfaces must cure for at least 30 days and have no moisture
problems. The surface should be primed with an Exterior Acrylic
Remove grease using a degreasing cleaner. Then, etch (roughen) the
floor by scrubbing with one part muriatic acid to three parts water.
(Wear rubber gloves and protective clothing.) Rinse well with water
and let dry for 48 to 72 hours. Cure 30 days. Before painting, perform
a moisture test. Tape a 600 mm square of plastic to the floor and
wait 48 hours. If concrete discolors or there is moisture on the
underside of the plastic, dont paint.
Once clean and the rust has been removed using a wire brush and
sandpaper, metal should be primed the same day it is cleaned with
the appropriate an All-Surface Enamel Primer. Unfinished galvanized
metal or aluminum should be wiped with degreasing cleaner, rinsed,
and dried. No primer is needed if it will be topcoated with latex
Brick must be free of dirt, loose and excess mortar, and foreign
All brick should be allowed
to weather for at least one year followed by wire brushing to remove
Treat the bare brick
with one coat of a masonry conditioner.
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