Coating defect: unsightly gravity-driven flow of a paint film applied on vertical surfaces. Caused by
to too much flow, often related to application technique or environment. Sagging
can be prevented by rendering the paint pseudo-plastic, but this may deteriorate
Moist, heavily laden air with a high chloride concentration. Used as a test
for accelerated corrosion evaluation.
Ease of sanding of a coating.
Appearance of paints having a 60?gloss reading between 10 and 40.
Ability of a coating surface to resist to damage caused by sharp and hard objects. Influenced by
the hardness, the coefficient of friction and the thickness of the film.
Ability of a coating surface to resist to damage caused by rough objects in the presence
of an active medium (water or organic liquid, abrasive material).
Coating used on absorbent surfaces prior to a finish coat.
Additive used in combinations with a primary drier to accelerate the drying
of a coating film. Syn. Auxiliary driers.
Coating defect: pigment and extender particles sinking to the bottom of the paint, caused by gravity.
The velocity of sedimentation increases with particle size and the difference in the density
between the particle and the medium liquid.
Coating defect: formation of small agglomerates or gel particles (seeds) in a coating.
Caused by resin insolubility, aggregation of pigment particles,
or a combination of both factors.
Formation of two or more phases in paints when
stored or heated. Can be caused by loss of compatibility between polymer components or by pigment
Coating defect: formation of hard sediments on
the bottom of the coating can due to aggregate instability of a pigment, extender or other solid
Particular hue or tone of the paint.
Period of time during which a paint stored according to the
manufacturer's instructions (packaging, temperature, humidity) retains its
Syn. Pot life
Catalyst used for drying according to the oxidative polymerization mechanism.
Negative effect caused by interaction between an additive and an other
component of the coating formulation. Can induce coating defects.
Polymeric product possessing a molecular backbone made
up of alternating silicon and oxygen atoms and which has pendant hydrocarbon
groups attached to the silicon atoms. Offers
excellent resistance to water and large variations in temperature (-100°F to
Coating defect: fine parallel irregularities in a paint film that give the
appearance of silk. This defect usually is a special case of floating and
flocculation in coating finishes.
Formation of a thin, tough film on the top of a liquid paint, caused by a
chemical reaction to moisture in the air (partial curing or drying of the
Additive which reduces the friction coefficient and thereby improve slip characteristics
of coating films. Various waxes, silicones or modified polyesters can be used
to increase surface slip.
Solids by volume
Percentage of the total volume occupied by nonvolatile compounds.
Solids by weight
Percentage of the total weight occupied by nonvolatile compounds.
Colloid form of dispersion between true solutions and emulsions. A solubilizate
is formed when a water-insoluble liquid is added to water in the presence
of an excessive amount of surfactant - more than is needed to form and stabilize
a regular direct
Substance that dissolves other substances. Usually readily
Coating defect: encapsulation of solvent within a cured coating due to improper formulation
or drying conditions. Results in a non-continuous film.
Combination of needle, tip, and air cap.
Configuration of coating sprayed on the surface.
Metal flake, pearlescent, sparkle and related pigment. Creates special optical effects such as
metallic, Hammer finish and different color perception depending on the angle.
Flow of a coating composition over the substrate to be coated driven by a
combination of forces, including the interfacial tension, gravity, mechanic
shear, and inertia, and controlled by the viscosity of the coating composition.
Coverage, usually at the specified dry film thickness.
Additive used to enhance coating durability and resistance to destructive
factors and protect coating film from chemical and structural changes.
Stress corrosion cracking
Coating defect: spontaneous cracking produced by the combined action of corrosion
and static stress.
Additive used to stabilize the polymer structure of the binder.
Surface to be coated.
Additive used to improve substrate wetting. Substrate wetting agents help
in promoting spreading, enhancing adhesion durability, and eliminating coating
Easy sanding paint used to fill depressions and surface irregularities in
order to obtain a smooth, uniform surface before applying the finish coat.
Energy required to expand the surface of liquid by unit area (N.m-1 or J.m-2). Liquids tend
to reduce their surface area due to unequal intermolecular attractive forces in
Syn. Interfacial tension
Additive used to provide improved mechanical, optical and electrical
surface properties to organic coatings. Enhances anti-blocking properties,
scratch and mar resistance, and imparts water-repellency. This type of additive is
used in wood, decorative, powder and coil coatings and in industrial, can coatings,
Defect of a coating application. Gives coating bad appearance or performance.
A coating defect can be caused by a lot of things such as poor substrate wetting,
loss of flow, surface deformation, solvent evaporation, air...
Viscous distortion of a surface layer of a fluid driven by mechanical shear,
gravity or surface tension.
Additive used to enhance slip properties, anti-blocking properties, or abrasion and scratch
of coating applications.
Additive which reduces surface tension thereby improving
wetting or helping to disperse pigments or inhibit foam.
Amphiphilic molecules of surfactants contain hydrophilic polar
and hydrophobic apolar parts. They tend to
adsorb at surfaces or interfaces.
Relatively coarse, noncolloidal dispersion of solid particles in a liquid.