Tempo:
do differ from one manufacturer to another, it is advisable to test a sample to make sure it has the desired reflectance. Pigment also provides resistance to ultraviolet light. For this reason, paint lasts longer in outdoor exposures than stain or varnish. Rust-inhibiting pigments are used in conjunction with other pigments in metal primers to provide corrosion protection. Resin: Resin is the film-forming ingredient that binds the pigment particles together after the paint has dried and gives physical characteristics such as adhesion and durability. Alkyd, latex and polyurethane are the resins used most frequently in coatings. Nitrocellulose is used most often for lacquer. As the resin content increases, gloss and durability increase, but the ability of a coating to conceal imperfections decreases. For this reason, a high resin content coating would be the desired option where a lot of wear is anticipated, and a low resin content coating is advisable where flaws must be masked in a prepared surface such as gypsum board (drywall).
TYPES OF COATINGS Paint Paint is a coating that provides solid colour. The vast majority of residential-quality paints use alkyd or latex as their principal resin ingredients. Properties such as gloss, sheen, hardness durability (including ability to be scrubbed without burnishing) and hiding ability are attained by adjusting the pigment/resin ratio. The suitability of paint for exterior or interior application is determined by the chemical composition of the resin. Resin for exterior paint provides the elasticity to accommodate temperature and dimensional changes, and permeability to allow moisture movement without blistering the paint.
Sealers and primers are specially formulated to seal the grain in wood, or the surface of interior finishes such as drywall or plaster. They also prepare surfaces to accept paints, stains or varnishes.
Varnish and polyurethane Varnish is a clear coating used as a topcoat over natural or stained wood for interior trim and architectural woodwork. It also has some exterior applications. Varnish is like paint but, because it is used as a clear finish, lacks hiding pigment. Most varnishes contain a resin combining alkyd with polyurethane. Water-reducible polyurethane is also available.
Stain Stain is a coating with a high solvent content that causes colouring to be absorbed into the cell openings of wood surfaces. The degree to which a stain penetrates can be adjusted for specific applications. Although some stains penetrate to the extent that they leave no surface residue, most penetrate but leave some surface coating. Stains are specially formulated to meet the specific requirements of interior and exterior uses. For exterior applications, stain is usually used alone but, in some instances, it may be top-coated with exterior quality varnish. When used alone, stain will alter the colour of the wood and provide a degree of protection from sun and water. For interior applications, stain is used to alter the colour of wood and to accent grain and texture. A transparent topcoat is usually applied to seal the surface.
Lacquer Lacquer is a fast-drying, protective top-coating used for fine finishing of architectural woodwork and furniture. It is normally used as a transparent finish, like varnish, to display the wood grain, but is also available in solid colours.
TYPES OF COATINGS Paint Paint is a coating that provides solid colour. The vast majority of residential-quality paints use alkyd or latex as their principal resin ingredients. Properties such as gloss, sheen, hardness durability (including ability to be scrubbed without burnishing) and hiding ability are attained by adjusting the pigment/resin ratio. The suitability of paint for exterior or interior application is determined by the chemical composition of the resin. Resin for exterior paint provides the elasticity to accommodate temperature and dimensional changes, and permeability to allow moisture movement without blistering the paint.
Sealers and primers are specially formulated to seal the grain in wood, or the surface of interior finishes such as drywall or plaster. They also prepare surfaces to accept paints, stains or varnishes.
Varnish and polyurethane Varnish is a clear coating used as a topcoat over natural or stained wood for interior trim and architectural woodwork. It also has some exterior applications. Varnish is like paint but, because it is used as a clear finish, lacks hiding pigment. Most varnishes contain a resin combining alkyd with polyurethane. Water-reducible polyurethane is also available.
Stain Stain is a coating with a high solvent content that causes colouring to be absorbed into the cell openings of wood surfaces. The degree to which a stain penetrates can be adjusted for specific applications. Although some stains penetrate to the extent that they leave no surface residue, most penetrate but leave some surface coating. Stains are specially formulated to meet the specific requirements of interior and exterior uses. For exterior applications, stain is usually used alone but, in some instances, it may be top-coated with exterior quality varnish. When used alone, stain will alter the colour of the wood and provide a degree of protection from sun and water. For interior applications, stain is used to alter the colour of wood and to accent grain and texture. A transparent topcoat is usually applied to seal the surface.
Lacquer Lacquer is a fast-drying, protective top-coating used for fine finishing of architectural woodwork and furniture. It is normally used as a transparent finish, like varnish, to display the wood grain, but is also available in solid colours.
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