Lac – A natural resin produced by insects living in the sap of certain oriental trees; the base for shellac.
Lacquer – A coating material with a cellulose base, which dries by solvent evaporation.
Laitance - An accumulation of fine particles loosely bound to the surface of fresh concrete. It is caused by the upward movement of water. Must be removed from the surface to avoid loss of adhesion of a coating system.
Lake – A colored pigment made by precipitating or absorbing a dye in a natural base material.
Lamination – Process of building up thin layers that are bonded together with an adhesive under heat and pressure to make one product.
Lampblack – A finely ground carbon pigment.
Lap – The point or area on a surface where two brush strokes or roller strokes meet.
Lapped Joint – Joint Made by lapping the trimmed edge of one wall covering strip over the selvage of an adjoining strip.
Lapping - Color and sheen differences that occur when wet and dry layers overlap during spray, brush or roller application. Also known as "Lap Marks".
Latex – A chemical emulsion used as a paint vehicle; also used to describe water-thinned paints.
Latex Paint - Water-based paint made with a synthetic binder (latex), such as acrylic, vinyl acrylic, or styrene acrylic latex.
Lay-off - A process where a brush is used to smooth out paint that has been applied to a surface.
Lead - A soft, malleable heavy metal. In the past, compounds of lead were used as a white pigment, and were used in primers to prevent tannin bleed-through.
Leather Paper – Heavily embossed and varnished paper imitating leather.
Leveling – The formation of a smooth film on a surface.
Lifting – Softening and raising of an undercoat by application of a top coat.
Light Fastness - The ability of a color or paint film to withstand exposure to sunlight without fading.
Light Reflectance Value (LRV) - The amount of light reflected from a painted surface.
Light Wavelength – the length of the space between peaks of the waves in which light travels. The wavelength is always the same for any given color of light.
Line – Merchandise belonging to one group or series offered by one manufacturer. In wall coverings, collections may appear every 2 years, every 18 months, or every 12 months.
Lining Fabrics – Muslin or canvas used under fine wall coverings to prevent possibility of small cracks opening up in plaster and showing through the covering.
Lining Paper – Plain paper used under fine-quality wall covering to obtain smoother surface and better adhesion before the wall covering is applied.
Linkrusta – Permanent wall covering on a paper backing coated with a linseed oil mixture. Designs in linkrusta are molded rather than printed.
Linseed Oil – The most used oil for oil paints; obtained from flaxseed; has excellent drying qualities.
Liquid Sander, Liquid Sandpaper - Liquid chemical used to de-gloss a painted surface in order to improve adhesion of an applied coating.
Long Oil Varnish – Varnish with a high ratio of oil to resin; these are usually slow drying and form softer flexible films.
Low Sheen Finish - A paint that has a low luster appearance. Its gloss level is between eggshell and flat.
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