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Online Painter's Glossary
The Letter "M"         M | P | D | A
MAGNESIUM OXIDE (MgO) A reactive, non-opaque, white pigment used at one time in small amounts in oil and alkyd paints to impart a thickening effect and reduce penetration to improve hold-out.
MAGNESIUM SILICATE White, non-opaque extender pigment which adds "fluffiness" to products in which it is used and is available in platy and fibrous particles. Also known as talc.
MAINTENANCE PAINTING (REPAINTING) The selective repainting of surfaces on an ongoing cyclic basis with the focus on prevention of coating and subsequent substrate failure.
The process includes the identification of defects / failures, then the assessment of the degree of surface degradation (DSD). Evaluate paint system options and establish surface preparation and recoating requirements. See MPI’s Identifiers
MAINTENANCE PAINTS Coatings commonly used to maintain or repair substrates and coatings in manufacturing sites, offices, public buildings, schools, commercial buildings, etc.
MALEIC ANHYDRIDE A di-basic acid. Used primarily in alkyd resins to produce paints and varnishes, but also in various co-polymers, polyester resins, rosin and terpene condensation resins.

A test to determine the adhesion and flexibility of a coating by bending a panel, with the coating applied to it, over a conical or rod shaped die (mandrel) of a specified diameter.
MANILA RESIN Derived from the Agathis alba species of trees. Manilas are a copal type of alcohol soluble resins found in various tropical countries. Thermal processing produces petroleum soluble resins used in the manufacturing of varnish.
MAR A mark caused by abrasion that damages the surface of a coating but does not remove significant amounts of material or break the film. Marring can appear as dulled gloss or as a lighter color in the case of a dark colored paint.
MARBLING Reproductions, imitations or simulations of realistic, infinitely varied grain and appearance of natural marble, rock limestone and other decorative stone (with the exception of granite). These are created with special colors of paint, colored stain or scumble glaze and specialized tools including artist’s, softening, marbling brushes, feathers, other bristle brushes, and combs. This effect seldom replicates very specific stones, instead are representations of the many varieties of marble. The layered look of the natural marble is comes from the repeated cycles of heating and cooling under pressures of nature. The veins generally run somewhat parallel although some diamond effects are common. Marbling is normally at least three coats. The base coat(s) sets the foundation. The next coat(s) generally implies the texture, and then the veins are added in a semi-transparent or opaque coat, darker than the base coat. The edges are then often feathered and softened. The topcoat(s) are generally clear, pigment-free coat(s) to protect the artistic effect.
MARINE COATINGS Paints and varnishes specifically designed to withstand constant exposure (some to water immersion) to marine environments. The exterior durability is generally quite good although some resins, like the phenolics that are used extensively for spar varnishes, tend to yellow or darken. Other products included as marine coatings are the anti-fouling (ship bottom) paints and topping paints. See also Anti-Fouling.
MARINE ENVIRONMENT An environment characterized by exposure to salt spray or salt water. Considered aggressively corrosive. There are protective coatings designed especially for these conditions.
MARINE FINISHES See Marine Coatings.
MARINE ORGANISMS Organisms, such as barnacles and algae, which grow on surfaces continuously or intermittently immersed in seawater. These organisms can cause damage and, on ship hulls, increase the drag or friction, reducing fuel efficiency. Anti-fouling coatings are specifically designed to inhibit the growth of these organisms on immersed surfaces. See also Anti-Fouling Paint.
MARINE VARNISH Varnishes especially designed for constant exposure in a marine atmosphere. Also known as marine spar varnish. See Spar Varnish.
MASK A material, such as tape, paper or a strippable coating, used to prevent the application of paint to certain areas of, or around, a substrate.
MASKING Application of a temporary covering (e.g. tape or paper) to protect areas not to be painted.
MASKING PAPER A kraft paper held in position by a strip of masking tape and used to temporarily protect surfaces adjacent to those being painted.
MASKING TAPE An adhesive coated paper tape, of various widths, used to cover\mask areas not to be painted.
...and much more...
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