Sags- Runs or sags in paint film that flows too much during application. Sags are usually caused by applying too heavy a coat of paint or thinning the paint too much.
Sandpaper- A sheet of abrasive-coated paper that is used for smoothing rough surfaces.
Sash Brush- An angled brush used for cutting-in.
Satin Finish- Gloss level measuring 7-22% reflection using a 60 degree meter.
Scaling- Process of delamination.
Scrubbability- The ability of a paint film to withstand scrubbing and cleaning with water, soap, and other household cleaning agents.
Sealer- A coating used to prevent excessive absorption of subsequent coats into a porous surface.
Seeds- Small undesirable particles or granules other than dust that are found in a paint, varnish or lacquer.
Semi-Gloss- A degree of gloss that is glossier than low lustre but not as glossy as high gloss. Gloss level measuring 40-60% reflection.
Semi-Transparent- A degree of ability to hide the underlying surface greater than transparent but less than opaque or solid color.
Set Up- The quality of a film that has dried until it is a film. The film is said to have “set up”.
Settling- Paint separation in which pigments and other solids accumulate at the bottom of the container.
Sheen- The degree of luster measured at a 85 degree angle.
Sheen Uniformity- The even distribution of luster over a dried paint film.
Shellac- A natural resin, usually in the form of thin flakes, that is derived from a resinous substance called lac. Shellac is used to seal and finish floors, seal knots, etc.
Skin- A tough covering that forms on paint when the container is not tightly sealed.
Solids- The solids content of a paint that is left over after the solvent evaporates. (Same as nonvolatile.)
Solvent- The volatile part of oil-based paints that evaporates during drying. Solvent-based thinners are used for thinning and cleaning up oil-based paints. In latex paints, water performs similar functions.
Spackling Compound- A material used as a crack filler for preparing surfaces before painting.
Spalling- The cracking, breaking or splintering of materials, usually due to heat.
Spar Varnish- A very durable varnish designed for exterior surfaces.
Spatter- Small particles or drips of paint that occur during the application of paint.
Specular Gloss- Mirror-like reflectance.
Sponging- A faux painting technique using a sponge to form tanslusent layers of glaze.
Spot Priming- Application of primer to spots that require additional protection because the old paint has been removed.
Spraying- A method of application in which the paint is broken up into a fine mist that is directed onto the surface.
Spreading Rate- Coverage.
Stain- A solution designed to color a surface without hiding it. Solid color and latex stains are available. Stains may be latex or oil-based.
Stippling- Is the technique of using small dots to simulate varying degrees solidity or shading. Also known as “Pouncing”.
Streaking- The irregular occurrence of lines or streaks of various lengths and colors in an applied film. Streaking is usually caused by some form of contamination.
Strie- A glazing technique for achieving a subtle mix of fine stripes by pulling a wide stiff bristled brush through wet glaze.
Strip- To remove old finishes with paint remover.
Stucco- A masonry finish that is usually applied to the exterior surfaces of buildings in place of siding or other materials.
Substrate- The surface that is being painted.
Synthetic Brush- A paint brush with filaments that are made from a non-absorbent plastic material such as polyester or nylon, rather than animal hair. Synthetic brushes are usually used for latex paint.
