​​​​​​​​​​​​​Xtra-Stop Base Coat

Xtra-Stop Base CoatXtra-Stop Base Coat is a 100% acrylic adhesive and base coat that is field-mixed with Type I or Type II Portland cement. It is noted for its water resistant properties.



​Highly water resistant

​Use to waterproof sloped parapets and window sills

Familiar 1:1 mixing ration

Easy to mix with less chance of error

​​Smooth, creamy consistency

​Trowels easily, speeds mesh embedment, reduces applicator arm fatigue, increases
job-site productivity

​Water based

​​Safe, non-toxic; clean up easily with soap and water


  • Xtra-Stop Base Coat is designed for use as the adhesive and/or base coat in several wall systems from Senergy. 
  • Xtra-Stop Base Coat is used with the Senerflex Wall System to adhere expanded polystyrene insulation board to the following acceptable substrates: 
    • ​​Senershield
    • Senershield-R
    • Unpainted and unglazed concrete or unit masonry
    • PermaBase® brand cement board (or other ASTM C1325 Type A Exterior approved cement boards)
    • ​Poured concrete/unit masonry
    • Fiberock® Aqua-Tough™ sheathing
    • ASTM C1177 sheathings (eXP® by National Gypsum, GlasRoc® by Certainteed and DensGlass® exterior sheathing)
    • Gypsum sheathing (ASTM C79/C1396)
    • New and untreated Exposure 1 or exterior plywood sheathing (Grade C-D or better)
    • Exposure 1 OSB
      Note: Wood-based sheathing substrates require priming with Senerprim.
  • Xtra-Stop Base Coat used with Senerflex EIFS, Senturion I, II, and III residential EIFS, Senergy Cement-Board Stucco System and all Senergy Surfacing Systems to embed corner mesh and Senergy Reinforcing Mesh.
  • Xtra-Stop Base Coat will also adhere expanded polystyrene insulation board (EPS) to expanded polystyrene insulation board, enabling the build out of architectural shapes and details.


27.2 kg per 19-liter pail (60 lbs per 5-gallon pail)


Approximate coverage rates are shown.
Adhere EPS insulation board to substrate:​​
  • 14.8 m² (160 ft²) per pail via notched trowel method
  • ​16.7 m² (180 ft²) per pail via ribbon & dab method
​​​​Embed Flexguard​ 4: 26 m² (280 ft²) per pail​
Embed Intermediate 12: 18.5 m² (200 ft²) per pail​
Embed Hi-Impact 20 and Flexguard​ 4: 14.8 m²(160 ft²) per pail
Adhere EPS insulation board to substrate and embed Flexguard 4: 11.1 m² (120 ft²) per pail​​
Xtra Stop Base Coat Product Bulletin

Xtra Stop Base Coat Product Bulletin