Use and Care Guide

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Atomization . . . . . . . . . . . . . . . . . .The use of compressed air to break up (atomize) a spray texture at spray gun orifice/tip.
Beading/Ridging . . . . . . . . . . . . . .A condition where flat joints become visible under critical lighting showing a narrow bead or ridge in the
center of the joint. No loss of bond. Syn: ridging, picture framing.
Bed Coat . . . . . . . . . . . . . . . . . . . . .First compound coat after taping. Syn: first finish coat.
Breakdown . . . . . . . . . . . . . . . . . . .1) How well material mixes into a lump-free homogenous solution. 2) Loss of viscosity a few hours after mixing.
Butt Joint . . . . . . . . . . . . . . . . . . . . .Joints formed by the mill cut ends or by job cuts without a tapered edge. Syn: end joint.
Corner Cracking . . . . . . . . . . . . . . .Hairline fracture or wider crack occurring in the apex of inside corners. Syn: shrinkage cracking, angle cracks.
Coverage . . . . . . . . . . . . . . . . . . . . .Area usually measured in square footage a given material will cover, i.e. 10 gals./1,000 sq. ft. of wallboard.
Syn: mileage, distance.
Delayed Shrinkage . . . . . . . . . . . .Shrinkage of preceding coats of particularly wet joint or topping compound after joints are completed or painted.
Depressed Nails . . . . . . . . . . . . . . .Depressions in the joint or topping compound directly over the head of a nail. Syn: dimpled nail heads, recessed nail
heads. Sometimes incorrectly referred to as shrinkage.
Dirt Collection . . . . . . . . . . . . . . . .A condition where dirt collects on the decorative coating directly over a nail head. Syn: nail spots.
Dry Hide . . . . . . . . . . . . . . . . . . . . . .The ability of a coating or texture to completely hide substrate when dry.
Drywall Primer . . . . . . . . . . . . . . . .A paint material specifically formulated to fill the pores and equalize the suction difference between gypsum
board surface paper and the compound used on finished joints, angles, fastener heads, and accessories
and over skim coatings.
Edge Cracking . . . . . . . . . . . . . . . .Straight hairline cracks at one or both edges of the joint tape. Shows through finishing coats and/or painting.
Syn: hairlines.
End Ply Separation . . . . . . . . . . . .Loss of bond between gypsum and wallboard face paper resulting in butt joints showing as high joints
or starved joints. Joint will have a hollow sound. Syn: end joint separation. Sometimes incorrectly referred
to as ridging or high joint.
Feathering . . . . . . . . . . . . . . . . . . . .Blending of finishing coats along the edges to minimize ridges and sanding. Syn: cutting, wiping.
First Finishing Coat . . . . . . . . . . . .Application of the first coat of joint or topping compound over tape, bead and nails.
Syn: second coat, filling, bedding, floating, bed-coat, pre-bedding, first-bed.
Flat Spots . . . . . . . . . . . . . . . . . . . .Areas on textured surfaces that have little or no aggregate. Syn: holidays.
Fogging In . . . . . . . . . . . . . . . . . . . .Spraying a ceiling with a fog coat or light overspray of spray texture.
Halo Effect . . . . . . . . . . . . . . . . . . .Overspray from wall texture or wall paint on ceiling texture which leaves a different color around the perimeter
of the room.
Hide . . . . . . . . . . . . . . . . . . . . . . . . . .The ability of paints and textures to conceal minor imperfections, allowing a surface to appear uniform in color
and texture.
High Joint . . . . . . . . . . . . . . . . . . . .Butt or tapered edge joint protruding above the plane of the board. Syn: crowned joint, crowning fat joint.
Horizontal Application . . . . . . . .Application of gypsum wallboard with the length perpendicular to the nailing members. Syn: around the room,
across the joists or studs.
Joint Blister . . . . . . . . . . . . . . . . . . .Looseness of paper appearing after the first finishing coat. Syn: bubbles.
Joint Darkening . . . . . . . . . . . . . . .Joint and nail spots that appear darker than the surrounding areas. Syn: burning, flashing, photographing, shadowing.
Joint Lightening . . . . . . . . . . . . . .Joints and nail spots that appear lighter than the surrounding areas. Syn: burning, photographing, lightening,
picture framing.
Joint Shadowing . . . . . . . . . . . . . .Joints that appear darker when viewed from an oblique angle yet show no color differentiation when seen from
a right angle. Usually caused by texture variation, low or high joints. Syn: Incorrectly referred to as burning,
flashing, photographing and joint darkening.
Joint Yellowing . . . . . . . . . . . . . . .Joint and nail spots that appear yellowish. Severity of discoloration may vary depending on paint color.
Syn: flashing, bleeding, yellowing.
Let Down . . . . . . . . . . . . . . . . . . . . .Drop in viscosity of the joint or topping compound after mixing. Syn: thinning, watering down, drop off,
slack off, milking.
Nail Dimpling . . . . . . . . . . . . . . . . .Depression in the wallboard surface resulting from setting nails with a wallboard hammer.
Nail Pops . . . . . . . . . . . . . . . . . . . . .Protrusions or bumps directly over a nail head. This condition normally occurs when wallboard is not in close
contact with the nailing members or lumber shrinkage. Syn: pops.
Glossary of Terms