DPC Damp Proof Course
A horizontal layer of impervious material generally used between the ground works and the above ground brickwork or other wall finishes and components to rising rising damp.
Dragging
Dragging 
A straight lined pattern created by using dragging brush (used in graining and broken colour techniques).
Drop Pattern
A term relating to wallpaper where the pattern is not repeated on a horizontal line.
See wallpaper symbols.
Dry Film Thickness Gauge
Dry Film Thickness Gauge
Used to measure the overall thickness of applied paint coatings onto ferrous metal.
Drying Time
The interval of time between the application and final cure of a coat of paint or varnish. (see Dust Dry, Surface Dry/Touch Dry, Hard Dry/Through Dry).
Dust Dry
The interval of time from when the paint or varnish coating is first applied to the time when it is resistant to dust particles in the atmosphere.