Sto Primer/Adhesive-B

Sto Primer/Adhesive-B — Versatile Polymer-Modified Adhesive & Base Coat for EIFS
Simplify your wall system installation with Sto Primer/Adhesive-B — a high-performance, polymer-modified, cement-based dry powder that functions as both adhesive and base coat for StoTherm® EIFS Systems. This multi-use product offers excellent bonding strength, vapor permeability, and ease of application for reliable façade performance.

Need a dual-function solution for adhesive and base coating? Sto Primer/Adhesive-B is designed to deliver durability, flexibility, and efficient application in one.

• Dual-purpose: adhesive and base coat in a single product
• Polymer modification for enhanced adhesion and freeze-thaw durability
• Smooth, creamy consistency for easy troweling
• Vapour permeable to protect against trapped moisture
• Powder form reduces waste and simplifies handling

System Composition & Coverage

• Material Type: Polymer-modified cementitious dry powder (mix with water)
• Packaging: 50 lb. bag
• Coverage Rates:
  • Adhesive over sheathing/smooth masonry: 90–125 sq ft per bag (1/2" x 1/2" U-notched trowel)
  • Adhesive over rough masonry: 30–45 sq ft per bag (5/8" x 5/8" square-notched trowel)
  • Base coat: 75–115 sq ft per bag
  • Skim coat: 90–135 sq ft per bag

Product Bulletin

Safety Data Sheet