USG SHEETROCK Ceiling Spray Textures - Manual

Surface Substrate surfaces to receive finish must be sound, dry, clean, and free of oil, grease, and efflorescence.
Preparation Discolored texture can result from application over surfaces that are unprimed, not thoroughly dry, or otherwise
improperly prepared. Prepare surfaces, maintaining min. 55 °F (13 °C) air, product, and surface temperatures
when applying joint compound and prime coat, as follows:
Glossy surfaces Lightly sand to dull any sheen and develop “tooth.” Wash surface with a strong detergent from
the bottom up to remove any dust, dirt, or sheen. A strong solution of TSP (trisodiumphosphate) works best; fol-
low manufacturer’s directions on container. Prime bare metal with a good rust-inhibitive primer and let dry.
New concrete Age at least 60 days before texturing. Fill cracks and holes and level concrete surfaces with
S HEETROCK ® Brand D URABOND ® Setting-Type or E ASY S AND ™ Lightweight Setting-Type Joint Compounds or C OVER
C OAT ® Brand Compound and let dry.
New drywall Treat joints and fasteners with an appropriate USG Joint Treatment System.
Note: Texturing over previously painted, textured, or stained substrate requires prior application of a stain-blocking
sealer to obtain uniform color.
Priming After prepared surfaces have dried thoroughly, apply a prime coat of undiluted S HEETROCK ® B RAND First Coat,
Substrate and let dry. (Or use a good quality white interior flat wall paint with high solids content.) The application of a
prime coat is intended to equalize surface porosity and provide uniform color, not to reduce sag potential.
For plaster surfaces apply a primer-sealer recommended by paint manufacturers for priming lime gauging and
lime-containing plaster finishes.
Maintenance/ Mixing Equipment Large tanks for mixing S HEETROCK Ceiling Spray Texture Clean out periodically to prevent premature spoilage.
Adjustments Self-contained horizontal mixing shaft spray units Periodically inspect and adjust rubber wipedown blades;
set mixer wall-to-paddle blade clearance for “small aggregate” (greater clearance leaves texture material
partially undispersed).
Pumping Equipment General Inspect and maintain according to manufacturer’s recommendations.
Material hoses Check all material hose lengths and connections. Minimize total hose length and number of line
splices; eliminate line splices, if possible. (Pumping problems increase with hose length; connections and line
splices are vulnerable to poly packing up and restricting material flow.)
Air hoses Check lines for air leaks; they reduce atomizing air pressure, and may cause problems.
Mixing During mixing, maintain air, water, and mix at min. 55 °F (13 °C). Use a clean mixing vessel, free of rust and
soured material. Fill mixing vessel with correct volume of water and power mix while slowly adding S
HEETROCK
Brand Ceiling Spray Texture powder. Mix initially to heavier consistency than desired for spraying. Then check
mixer paddles/shaft and corners of mixing vessel for unmixed material. Remove with light water spray. Remix until
powder is completely wet, creamy and lump free, and allow mixture to soak for at least 15 minutes—longer with
cold water. Thin mixture to spraying consistency by adding small amounts of water until final water/powder ratio
is as directed on bag. (Avoid excessive water, which can cause board sag, check-cracking, poor texture bond and
lack of hide.)
S
HEETROCK
®
Brand
Ceiling Spray Textures
Application Tips
QT Page 1 of 2