Sto Launches StoSeal™ STPE Sealant, a Versatile, High-Performance Adhesive Sealant

ATLANTA, GA (May 25, 2023) Sto Corp., the innovative North American leader in exterior claddings, air barriers, coatings, and building restoration solutions, has launched StoSeal™ STPE Sealant, a premium, low-odor, isocyanate free, one-part hybrid sealant with a VOC content of 8 g/L. StoSeal STPE Sealant is durable, flexible, resistant to moisture and weathering, and tested to perform per ASTM C920 class providing Type S, Grade NS, Use NT, A, M, and +100/-50% movement capability.  It meets Federal Specification TT-S-00230C Type II and AAMA 808.3 (Type 1) Exterior Perimeter Sealing requirements and has been tested in accordance with ASTM C1382 for use with EIFS systems.

“StoSeal STPE Sealant’s excellent adhesive properties provide primer-free bonding to most substrates and fast tack-free and cure times, resulting in a paintable, low dirt pickup sealant for new opaque wall and building restoration applications,” says Director of Business Development Richard Martens.  “It works effectively with StoTherm® ci, StoPowerwall®, StoQuik®, StoVentec® exterior wall systems and with StoGuard® air and water-resistive barrier systems.  It is suitable in panel-to-panel joints in prefabricated construction, metallic and cementitious substrates, storefront systems, interiors, concrete repair, and air sealing applications.”

StoSeal STPE Sealant is packaged in 20-oz sausages that minimize construction waste and provide efficient installation. It is available in eight standard colors, with over 300 custom colors available upon request.  StoSeal STPE Sealant can be top coated with elastomeric coatings to suit most color requirements.

For more information, visit

#   #   #

About Sto

Sto is an international technology leader in the design and production of innovative building materials tailored to human needs. Our wall systems, coatings and finishes have been the choice of leading architects, engineers and contractors for over 60 years, and we are the world’s largest manufacturer of exterior thermal insulation systems, with 50 subsidiaries, more than 5,500 employees, and 21 factories operating around the globe.

Sto Corp., based in Atlanta, Georgia, offers a broad range of advanced cladding, air and water-resistant barrier and coating systems that deliver energy efficiency and superior aesthetics for building construction, maintenance and restoration. The company has also expanded into complete single-source Rainscreen and Industrialized Construction. Sto Corp’s plants are ISO certified for environmental protection and quality control and are strategically located to serve more than 200 distributor shipping locations throughout US. Sto Corp. is committed to developing next-generation building solutions and the company’s employees are advocates for technical mastery in pursuit of a sustainable built environment.

For more information, visit or call toll free (800) 221-2397. Follow Sto Corp. LinkedIn,  Facebook at,  Twitter and the Sto blog