| Mist Coat |
A thin tack coat usually applied to fill
porous surfaces such as zinc rich primers. |
| Monomer |
A substance of low molecular weight molecules
capable of reacting to form longer molecules called polymers. |
| Mottled |
Spots of different tones and colors next to
each other resulting in a blotchy effect on the coating film. |
| Mudcraking |
A paint film defect characterized by a broken
network of cracks in the film. |
| MULTI-GARD® |
MULTI-GARD is a trade name used by the
Carboline Company to describe a group of coatings made for the railcar industry. |
| Muriatic Acid |
Concentrated hydrochloric acid often diluted
and used for etching concrete. |
| NACE |
National Association of Corrosion Engineers. |
| Neutral |
A liquid which is neither acid nor alkali such
as water; pH7. |
| Non-Drying Oil |
An oil which undergoes little or no oxidation
when exposed to air and therefore has no film forming properties. |
| Nonferrous |
A term used to designate metals or alloys that
do not contain iron; example: brass, aluminum, magnesium. |
| Nonflammable |
A compound which does not burn in the presence
of a flame. |
| Nonvolatile |
The portion of the paint left after the
solvent evaporates; solids. |
| Oil Length |
The ratio of oil to resin expressed as a
percentage of oil by weight in the resin. Used to determine the physical properties of a
resin. |
| Opacity |
The ability of a paint film to obliterate or
hide the color of the surface to which it is applied. |
| Orange Peel |
The dimpled appearance of a dried paint film
resembling the peel of an orange. |
| Organic |
Designation of any chemical compound
containing carbon. |
| Organic Zinc |
A zinc rich coating utilizing an organic resin
such as an epoxy. |
| Osmosis |
The diffusion of liquid through a paint film
or other such membrane. |
| Overspray |
Sprayed coating that is dry when it hits the
surface resulting in dusty, granular adhering particles, reducing gloss and presenting a
poor appearance. |
| Oxidation |
The formation of an oxide; the curing
mechanisms for alkyds. |
| Paint |
(Verb) To apply a thin layer of coating to a
substrate by brush, roller, spray or other suitable method. (Noun) A pigmented liquid
designed for application to a substrate, in a thin layer, which is then converted to an
solid film. Paint is designed to protect and/or decorate the surface it is applied to. |
| Pass |
The motion of a spray gun in one direction
only. |
| Passivate |
To make a surface such as steel inert or
unreactive, usually by chemical means. |
| Paste |
The product of a dispersion process. It is
usually very high viscosity and requires dilution prior to application; a concentrated
pigment dispersion used for shading. |
| Pattern |
The shape or stream of material coming from a
spray gun. |
| Peeling |
A film of paint or coating lifting from the
surface due to poor adhesion. Peeling normally applies to large pieces. (See chipping) |
| Permeability |
The degree to which a membrane or coating film
will allow the passage or penetration of a liquid or gas. |
| pH |
A measure of acidity and alkalinity; pH 1-7 is
acid and pH 7-14 is alkali. |
| Phenolic |
A synthetic resin used for heat or water
resistance. |
| PHENOLINE® |
PHENOLINE is a trade name for a group of
Carboline Company, heavy duty, chemical resistant coatings. |
| Phosphatizing |
A pretreatment of steel by a chemical solution
containing metal phosphates and phosphoric acid to temporarily inhibit corrosion. |
| Pickling |
The treatment of steel for the removal of rust
and mill scale by immersion in a hot acid solution containing an inhibitor. |
| Pigment |
A finely ground natural or synthetic,
insoluble particle adding color and opacity or corrosion inhibition to a coating film. |
| Pigment / Binder Ratio |
A ratio of total pigment to binder solids in
paint. |
| Pigment Grind |
The action of dispersing a pigment in a liquid
vehicle. |
| Pigment Volume Concentration
(PVC) |
The percent by volume occupied by pigment in
the dried film of paint generally expressed as a percentage. |
| Pinholing |
A film defect characterized by small,
pore-like flaws in a coating which extend entirely through the film. |
| Plasticizer |
An agent added to the resin to aid in
flexibility. |
| Polyester Resin |
A group of synthetic resins which contain
repeating ester groups. A special type of modified alkyd resin. |
| Polymer |
A substance of molecules which consist of one
or more structural units repeated any number of times. |
| Polymerization |
A chemical reaction in which two or more small
molecules combine to form large molecules containing repeated structural units. |
| Polyurethane |
An exceptionally hard, wear resistant coating
made by the reaction of polyols with a multi-functional isocyanate. |
| Polyvinyl Chloride (PVC) |
A hard tough plastic solid used for plastics
and coatings, commonly known as vinyl. |
| Porosity |
The presence of numerous minute voids in a
cured material. |
| Pot Life |
The length of time a paint material is useful
after its original package is opened or a catalyst or other curing agent is added. |
| Potable Water |
Water fit for human consumption; as in
drinking water. |
| Practical Coverage |
The spreading rate of a paint calculated at
the recommended dry film thickness and assuming 15% material loss. |
