Optimal strength and performance for the toughest, straightest edge.

Mud applied, extra tough drywall corners that withstand severe impacts and settling. Won't blister, bubble or edge crack.
Available in Outside and Inside 90°, 3/8" Bullnose, L-Trim and Arch profiles.

Product Data
Outside 90° 8' 50 sticks/carton
Outside 90° 9' 50 sticks/carton
Outside 90° 10' 50 sticks/carton
Outside 90° 12' 50 sticks/carton
Inside 90° 8' 50 sticks/carton
Bullnose 3/8" 8' 50 sticks/carton
Bullnose 3/8" 9' 50 sticks/carton
Bullnose 3/8" 10' 50 sticks/carton
L-Trim 1/2" 10' 50 sticks/carton
L-Trim 5/8" 10' 50 sticks/carton
Bullnose 3/4" Arch 10' 10 sticks/carton
Bullnose 3/8" Arch 10' 10 sticks/carton
Outside 90° Arch 10' 10 sticks/carton


Technical References:
ASTM C475: Standard Specification for Joint Compound and Joint Tape for Finishing Gypsum Board.
ASTM C840: Standard Specification for Application and Finishing of Gypsum Board.
GA-214: Gypsum Association publication “Levels of Gypsum Board Finish.”
GA-216: Gypsum Association publication “Recommended Specifications for the Application and Finishing of Gypsum Board.”

Using the taping knife, apply joint compound to drywall, slightly beyond where the edge of the corner will be.
Or use hopper to fill bead. Place corner trim on wall, ensuring it is aligned tightly to the ceiling. Press into position. Use the roller to embed the trim. Or embed using even pressure, running the knife over it at a 45° angle. Use the taping knife to skim over the edge with joint compound. Let dry thoroughly. Use the wider finishing knife to skim over the edge again. Let dry thoroughly. Lightly sand and paint.


For more detailed application instructions, refer to the Optimus Data Sheet.

Since methods and condition of application such as temperature, humidity and over thinning are beyond our control, CertainTeed Gypsum, Inc. (CertainTeed) will not be responsible for the failure of this product when not used according to directions and specifications and accepted standards of procedure inherent in drywall application; or when reasonable allowance is not made by the user for adverse weather and job conditions. However, if this product proves to be defective, maximum liability shall be limited to replacement of the material only or refund of the purchase price. This shall be the full limit whatsoever of CertainTeed’s liability. All claims shall be submitted in writing to CertainTeed within thirty days from the date of discovery. State or federal laws may provide rights in addition to this warranty that cannot be modified or excluded.
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