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Masking:
Temporary covering to protect areas not being painted.
Master Painter:
A paint craftsman who has attained a level exceeding that of a journeyman.
Material Safety Data Sheet (MSDS):
A document that lists hazardous ingredients, proper handling, storage, first aid, disposal and other safety information related to all products used in the workplace. Coating manufacturers are obligated to provide copied to the point of distribution who, in turn, are obligated to provide same to the end user.
Matte (Matt) Finish:
A low gloss finish, lacking specular gloss, low luster. A description of a painted surface that absorbs light so as to be substantially free from gloss or sheen when viewed at any angle. See also Flat.
Metal Primer:
A coating, often the anti-corrosive type, designed for application to clean metallic surfaces to provide an adhesive base coat for subsequently applied finishes.
Mildew:
A variety of fungal species of the family Erysiphaceae. Commonly, mildews on painted surfaces are either black or gray. Mildew can be seasonal, but is mostly seen in damp humid environments that receive little or no sunlight.
Mill Scale:
The mixed oxide layer formed during hot fabrication or heat-treatment of steel and iron metals. It appears as a tightly bound black material that should be removed prior to priming.
Mock Up:
A representative example of a paint system or wall covering application used as reference standard or benchmark standard for the remainder of a project.
Moisture Content:
The amount of water vapor or liquid water contained within a substrate.
MSDS:
See Material Safety Data Sheet.
Mullion:
A vertical bar or divider in a window frame that separates two or more panes.
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