Schönox AST

Synthetic Gypsum based rapid drying smoothing and repair compound suitable to provide a smooth finish on various substrates in interior areas. Schönox AST can be installed as a true featheredge.

Schönox AST

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Technical Data

Compressive Strength:

(ASTM C109/mod-days air cure only): 23N/MM sq / 3600 psi at 28 days


(depending on texture of substrate)
Per unit of 4.5kg/10lbs.:
Approx. 180 sq.ft. when applied as a true featheredge
Approx. 33 sq.ft. at 1/8″


EC 1PLUS : very low emission


IEQ 4.3 Low-Emitting Materials-Flooring Systems, 1 point
MR 1.1 Building Reuse Maintain Existing Walls, Floors and Roof, up to 3 points
MR 1.2 Building Reuse Interior-Maintain Existing Interior Nonstructural Elements, 1 point
MR 4 Recycled Content, up to 2 points

Pot Life:

Approx. 20 minutes at 68˚F

Ready for covering:

After approx. 30 minutes when applied as a true featheredge
After approx. 12 hours at 1/8″ thickness

Shelf Life:

1 year unopened

Working Temperature:

Not below 41°F floor temperature

Product Details




33lb. net weight in paper bags
10lb. net weight in paper bags