flexible primer interface for direct-applied stucco

  • StuccoPrime-1-Gal
  • StuccoPrime-1-Gal


flexible primer interface for direct-applied stucco

StuccoPrime is a flexible primer interface that allows stucco to be applied to CMU, masonry and concrete surfaces that have been protected with Cat 5 or waterproofed with FastFlash.

Available at distributors nationwide. Call 800-255-4255.

Ted Barnekoff - Air & Water Barriers, PROSOCO

Ted Barnekoff, Air & Water Barrier Customer Support

  •  Single component – saves time
  • Promotes bonding to surfaces protected with
    R-Guard Cat 5™ or waterproofed with FastFlash®.
  • Slow drying allows stucco scratch coat to be
    applied wet-on-wet. Bond strength increases as
    stucco layers are fully hydrated.
  • SHELF LIFE2 years in tightly sealed, unopened container
  • FORMGreen viscous liquid mild odor
  • PHNot-applicable
  • COVERAGE RATEApplied at 6–8 mils: 150–180 sq ft per 1-gallon and 750–900 sq ft per 5-gallon
  • FREEZE POINTNot-applicable
  • FLASH POINT>200° F (>93° C)
  • WT/GAL13.312 lbs
  • AVAILABLE SIZES1-gal, 5-gal


Cementitious stucco, mortars and plasters bond tenaciously to StuccoPrime while preserving the integrity of the underlying waterproofing membrane. Applied wet-on-wet, StuccoPrime and the stucco scratch coat cure together, forming a strong chemical and mechanical bond.


StuccoPrime dries slowly to allow time for the stucco scratch coat to be applied to the primer, and cures in contact with the stucco scratch coat. StuccoPrime is not water-reduced and will not emulsify when exposed to water. This single-component, 100%-solid, silyl-terminated polymer (STP) is designed for brush, roller or trowel application.


PROSOCO R-Guard® StuccoPrime is a special-order product available to approved applicators only. Site-specific training by an R-Guard field technical representative is required to project-certify stucco installation crews in proper use and application of R-Guard StuccoPrime.