BACKER ROD:
An extruded foam rod that is typically placed in joints that are deeper than 1/2" (12.5 mm) to fill in some of the space before the sealant is applied. Foam backer rods come in a variety of diameters, ranging from 3 mm to 20 mm

BINDER:
1. A component of paint that "binds" the pigment particles into a uniform, continuous paint film, and makes the paint adhere to the surface. The nature and amount of binder helps determine most of the paint's performance properties - washability, toughness, adhesion, colour retention, and durability. 2. In sealant, a component that "binds" the pigment particles into a homogeneous compound and makes the sealant adhere to the surface. The main performance properties of sealant - durability, adhesion, and flexibility at low temperatures - are determined by the binder.

BIOCIDE:
A biologically active paint and sealant additive designed to keep bacteria from spoiling the paint or sealant during storage; or to keep mildew from growing on the applied paint.

BLEACHING:
Loss of colour, usually caused by exposure to sunlight.

BLEEDING:
The migration of material from the substrate, causing discolouration of the paint.

BLISTERING:
The formation of dome-shaped, hollow projections of paint.

BLOCK FILLER:
A thick, paint-like material used to smooth out very rough masonry surfaces like concrete block. It is generally brush-applied, then painted.

BLOCK RESISTANCE:
The capability of a coating to resist sticking to itself when used on two surfaces that come into contact with each other, e.g., door and jamb; window sash and sill.

BOXING:
The mixing together of the different cans of like paint to be used on a job, to ensure uniformity, especially of colour.

BREATHE:
To allow the passage of moisture vapor from the substrate through the paint film.

BUILD (or FILM BUILD):
The thickness that a paint tends to be applied in, when using the normal application technique for that paint.

BURNISHING:
The formation of shiny areas on a painted surface, as a result of rubbing or washing.