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Glossary

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

P.V.A. (Polyvinyl Acetate) A binder most widely used in interior latex wall paints.
Paint (Verb) To apply a thin layer of a pigmented, opaque coating to a substrate by brush, roller, spray or other suitable method.

(Noun) A opaque pigmented finish 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. Generally a paint contains binders (resins), solvents, pigments, and additives. Paints may be pigmented oil-base coatings, waterborne coatings, lacquer coatings, catalyzed coatings, etc..

Pass The motion of operating a spray gun in one direction only.
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 Shape of stream of material coming from a spray gun. Also the sequence of spraying various items to maintain a wet edge and avoid overspray.
Peeling A film of coating lifting from the surface due to poor adhesion.
Penetrating Finish A coating that is absorbed into the substrate rather than forming a film on its surface. Drying oils are penetrating finishes.
Percent Solids Percentage mass of non-liquid components in coatings.
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 Resin Thermosetting synthetic resin produced by the condensation of phenol with an aldehyde (e.g., formaldehyde). Provides very good heat and water resistance.
Photoinitiator 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.
Pickling Application of a white, off-white, or pastel pigmented stain on bare wood leaving as little or as much color as desired. Thinned paints work very well.
Pigment A finely ground natural or synthetic, insoluble particle adding color and opacity or corrosion inhibition to a coating film.
Pigment Volume Concentration (PVC) The percent by volume occupied by pigment in the dried film of paint generally expressed as a percentage.
Pigment/Binder A ratio of total pigment to binder solids in coatings.
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. 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.
Polyester Resin A group of synthetic resins which contain repeating ester groups. A special type of modified alkyd resin. Polyester finishes are among the most durable.
Polymer Large organic molecule formed by combining many smaller molecules (monomers) in a regular pattern. Plastic-like material produced from chemical "monomers" which in turn have been produced from alcohols and petrochemicals. Certain polymers are used in waterborne finishes and paints. The binder’s polymer particles are small and carried in water. The binder polymer particles and water mixture is known as an emulsion or as “latex”.
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 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) 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.
Post-cure reaction 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.
Pot Life The length of time a coating material is useful after its original package is opened or a catalyst or other curing agent is added. As mixed material reacts in the pot, the viscosity always increases.
Potable Water Water fit for human consumption; as in drinking water.
Powder coating 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.
Practical Coverage The spreading rate of a coating calculated at the recommended dry film thickness and assuming 15% material loss.
Precipitate An insoluble substance separated from solution by the action of some reagent added to the solution, or of some force, such as heat or cold. The precipitate may fall to the bottom, may be diffused through the solution, or may float at or near the surface.
Primary Colors Colors that cannot be produced by mixing any two other colors. They are red, yellow, and blue.
Primer The first complete coat of paint applied in a painting system. Many primers are designed to provide adequate adhesion between the surface and subsequent topcoats. Most primers contain some pigment, some lend uniformity to the topcoat, some inhibit corrosion or the substrate, and some stop the discoloration of the topcoat.
Primer-Sealer A priming system that minimizes or prevents the penetration of the topcoat into the substrate.
Print Resistance The ability of a coating to avoid pressed-in markings from an object placed on it.
Pyrometer An instrument used to measure the temperature of a surface.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z


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