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Primers
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A material used for the first coat of paint or as the
prime coat in a protective
coating system. Primers are
designed to promote adhesion of the coating system to
the
substrate, to furnish a good base for further
coatings, and to prevent attack on the substrate
by air,
water, or other materials.
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Wood primers are formulated to give maximum adhesion
and to provide adequate flexibility for adjustment to
dimensional changes that occur when wood swells or
shrinks because of changes in moisture content. Primers
used as the undercoat
for enamels must provide a smooth film and permit easy
sanding.
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| Metal primers must provide excellent adhesion by
mechanical anchorage or chemical bonding. Modern
corrosion-resistant coating systems applied over steel
contain inorganic or organic zinc dispersed in a
suitable vehicle. Zinc is attacked by the
electrochemical corrosion process preferentially before
steel, and protects the steel substrate by this
sacrificial
property. Prime coat materials for nonferrous metallic
substrates usually are generically related to materials
used in subsequent coats.
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| Primers for porous surfaces such as concrete must
seal the surface adequately to provide a uniform base
for future coatings.
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Primers are always pigmented. In clear finishes the
coat which performs this function is described as a
sealer,
an under-coater, or a wash coat.
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To
Learn More about Common Products that we
offer click
on the
links below
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| C
2007 Florida Finishing, LLC |
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