Material which, when applied as a liquid to a surface, forms a solid film
for the purpose of decoration and/or protection. Generally a paint contains
binders (resins), solvents, pigments, and additives.
Motion of a spray gun in one direction only.
High viscosity product that requires dilution prior to application. For example,
it can be a concentrated pigment dispersion used for shading.
Shape or stream of material coming from a spray gun.
Pigment exhibiting various colors depending on the angles of illumination and viewing,
as observed in mother-of-pearl. Pearlescent pigments are also called nacreous pigments.
Paint or coating lifting from the surface due to poor adhesion.
Percentage mass of non-liquid components in paint.
Additive used to enhance various properties of the coating.
Examples of performance additives are: surface conditioners (slip aids, anti-blocking,
anti-scratch additives...), light and heat stabilizers, corrosion inhibitors,
adhesion promoters... .
Abaility of a coating film to allow the passage or penetration of a liquid
Spontaneous separation of polymer solutions into two phases, forming polymer/polymer
emulsion or double-layer system.
Syn. Phase separation
Thermosetting synthetic resin produced by the condensation of phenol with an aldehyde
(particularly of with formaldehyde). Provides very good heat and water resistance.
Additive which, when exposed to a specific wavelength of energy, forms a reactive species
which starts the chain reaction to cause polymer formation. Most commercial photo-iniators
for radical curing reactions contain benzoil groups, which are mainly responsible for the absorption
of energy from light.
Syn. Photo-curing material
Measure of acidity and alkalinity. pH 1-7 is acid and pH 7-14 is alkali.
Additive use to stabilize the pH of a coating.
Finely ground natural or synthetic, insoluble particle adding color
and opacity or corrosion inhibition to a coating film.
Note: In contrast, a dye
Percent by volume occupied by pigment in the dried film of paint (expressed
as a percentage).
Coating defect: small, pore-like holes in a coating film about the size of a pinpoint. Extend
entirely through the film.
Compounding material used to enhance the deformability of a paint, varnish
or lacquer. A plasticizer is soluble in the polymer and decreases the glass transition
temperature (Tg) value, softens and adds flexibility to the product.
Synthetic resin in which the structural units are linked by ester grouping.
Large organic molecule formed by combining many smaller molecules (monomers) in a regular
Chemical reaction that links monomers to form polymers.
Polymer made by the reaction of polyols with a multi-functional isocyanate.
Provides toughness, flexibility, weather resistance, chemical resistance,
and abrasion resistance to the coating film. Commonly used to make topcoats.
Polyvinyl Chloride (PVC)
Hard tough plastic solid used for coatings, commonly known as vinyl. Produced
by the polymerization of the gas vinyl chloride
Crosslinking reaction which occurs in cured coating due to the
presence of an excess of a hardener. Can cause coating defects such as
internal stress, decreasing adhesion durability and flexibility.
Length of time a coating material is useable or sprayable after mixing. As mixed
material reacts in the pot, the viscosity always increases.
Syn. Shelf life
100% solid coating generally applied by an electrostatic process as a fine,
dry powder to the surface and then heated above its melting point so the powder
particles flow together or cure.
Spreading rate of a paint calculated at the recommended dry film thickness
and assuming 15% material loss.
Substance added to protect, prevent, or retard decay, discoloration, or
spoilage under conditions of use or storage.
Drier containing Co, Mn or V ions.
Syn. Active drier
Smallest particles of pigments and extenders that can be obtained during production.
First of two or more coats of paint, varnish or lacquer system. Primer improves
adhesion, corrosion resistance of the substrate, or increases compatibility
with the topcoat.
Colored or pigmented liquid or paste composition that
dries to a solid film after application as a thin layer by
Additive which improves the processability of a coating.
Examples of process additives are: defoamers,
dispersants, emulsifiers, driers and catalysts, rheology control additives,
or wetting agents.
Anchor pattern of a surface produced by sandblasting, acid etching, or similar
Additive used to protect coating against light, corrosion or bacteria degradation.