Technical data

thick a coating can result in pock marks. To overcome this
condition, apply thinner coatings, use less air pressure, and
use a high solvency thinner.
POLYMER — A substance composed of large molecules
formed by the combination of a number of simple molecules
with one another by chemical reaction.
PRIMER — A coating applied directly to the basic metal or
pretreated metal and upon which a subsequent coating or
topcoat is applied.
PSI — Pounds per square inch. A measure of pressure of
fluids and gasses.
R
RAISING — The appearance of wrinkles or blisters in a
film; often due to a reaction of lacquer solvents with
unoxidized oil films in oil base undercoats.
RELATIVE HUMIDITY — The ratio of the actual
amount of moisture in the air to the maximum amount it
could contain at the same temperature, expressed as a
percentage.
RESIN — A natural or synthetic substance usually organic
in composition, characterized by being amorphous (non-
crystalline), isotropic (properties being the same in all
directions), plastic, often sticky and usually fusible and
soluble at some stage in its manufacture or processing.
RUNS — Rivulets in a coating caused by too much organic
coating material or thinner being applied to an area at one
time.
S
SOLVENT — Any liquid which will dissolve another sub-
stance. Solvent power of a liquid is specific, that is, it can
dissolve certain substances but not others.
SOLVENT RESISTANT COATING — A finish/paint
system such as an epoxy or a polyurethane that is catalyzed
and cures by chemical reaction in conjunction with solvent
evaporation. These coatings are highly resistant to solvents/
thinners after they completely cure.
SPRAY DUST — Paint dust that causes surface roughness
when a spray gun is held too far from the work, especially
when a highly volatile thinner is used. This is caused by
solid particles in the coating material drying up while
traveling from the nozzle to the surface being sprayed.
Insufficient thinning or too high air pressure may also cause
spray dust. Correct by spraying at lower air pressures,
adjusting distances to between 6 to 10 inches from the work,
and/or by increasing the thinner content.
STRIPPING — Removal of paint from a surface.
SURFACE TENSION — The property of a liquid by
which the surface film of a liquid tends to form into a
sphere. Surface tension affects the ability of a liquid to wet
a surface. The higher the surface tension, the poorer the
wetting.
T
TIECOAT — A two-component, VOC, solvent-borne, lead
and chromate free epoxy coating particularly formulated for
its adhesion properties to other coatings.
THIXOTROPY — The property of a coating which causes
it to undergo a gel-sol-gel transformation upon agitation and
subsequent rest. Upon agitation it becomes quite fluid but
readily falls back again to the semi-solid form after the
agitation is stopped.
TONER — Organic pigments which do not contain inor-
ganic pigments or inorganic carrier bases.
V
VARNISH — A liquid resin material which after applica-
tion converts to a transparent or translucent solid material.
VEHICLE — The liquid carrier portion of a paint/coating.
W
WET SPOTS — If metals are not thoroughly cleaned of
oils and greases before painting, those areas which retain the
foreign material become wet spots or fish-eyes. The condi-
tion is characterized by a sticky coating film which requires
extremely long drying time and often remains soft or
wrinkled. Stripping of the paint film, cleaning, and refinish-
ing is required to correct this condition.
WRINKLE FINISH — In those cases where wrinkling is
undesirable, it is a defect caused by improper application,
usually of too heavy a coating, an abnormally high or too
rapid a rise in temperature, or high humidity. Avoid these
conditions by applying thinner films, allowing sufficient
drying time between coatings, and avoiding extremes of
temperatures and humidity.
Z
No. 2 ZAHN Cup/No. 4 Ford Cup — A small portable
viscosity measuring device.
TO 1-1-8
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