Rapid Set Mortar Mix 55 lb. (Model RSMM55)

Rapid Set Mortar Mix is a fast-setting, high-strength repair mortar designed to tackle a wide variety of patching and repair jobs. Its easy-to-use, single-component formula requires only water—no additives—so you can mix, apply, and finish in a fraction of the time of conventional mortars. Ideal for professionals and DIYers alike, this versatile mix works equally well for vertical, overhead and horizontal applications.

Whether you’re filling cracks, rebuilding stucco, setting tile or creating smooth underlayments, Rapid Set Mortar Mix delivers exceptional durability and rapid turnaround. Achieve full strength in just a few hours and move on to the next phase of your project without delay.

Key Features

• Fast-setting formula reaches initial set in just 1 hour
• High compressive strength (6,500 PSI) for long-lasting repairs
• Suitable for vertical, overhead and horizontal applications
• Ideal for crack repair, underlayment, one-coat stucco repair and pre-casting
• Thickness range from ½″ to 6″ in a single lift
• Made in the USA; non-hazardous, single-component blend

⚠️ WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.