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The primer coat is
critical to a quality paint job. A primer should be used
if the surface is very porous or is at all uneven in porosity;
or if all chalk cannot be removed from the surface. It is
also very effective even when used over sound painted surfaces
to maximise adhesion of new coats and ensure the uniformity
of gloss or sheen of a finish coat. As a general rule any
previously unpainted or unstained surfaces should be primed.
And, depending on the surface, a special stain-blocking
primer may be necessary. Although both water-based and solvent-based
primers are available for most applications, solvent-based
primers usually provide superior stain-blocking. Keep in
mind that primers have been developed specifically for different
surfaces and it is vital that the proper primer be used
for wood, masonry, hardboard, or metal substrates and that
the primer is formulated for exterior use. Be sure to read
manufacturer recommendations about spread rates (how large
an area can be covered per litre), drying time before a
top coat can be applied, how long the primer can be left
before it must be top coated, and how advisable it is to
apply a second primer coat. These factors are important
to ensure the best finish coat results.
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