HYDROSTOP® PremiumCoat® Foundation Coat


The HydroStop® PremiumCoat® Foundation Coat is a water-based acrylic base coat. Used in conjunction with the HydroStop® PremiumCoat® Finish Coat and the HydroStop® PremiumCoat® Fabric, it creates the HydroStop® PremiumCoat® System which is a roofing and waterproofing solution for coating, recover, reroof and new roof applications. It provides a fully-adhered, adhesively attached, breathable acrylic membrane and a complete roof cover.

Sizes Available:

2 gallon (7.6 liter) bucket
5 gallon (19 liter) pail
54 gallon drum


  • Metal (historic or commercial) roof waterproofing
  • Flat and low-pitched roof waterproofing, including BUR, concrete (structural or LW), EPDM, Hypalon, modified bitumen, PVC, and TPO
  • Parapet wall & Exterior wall waterproofing
  • Flashing of all types

Physical Properties

Finish Flat
Color Patina Green
VOC 49 g/L (calculated)
Solids by Volume 52% (±2) [ASTM D2697]
Solids by Weight 66% (±2) [ASTM D1644]
Density 12.0 (±0.3) lb/gal
Viscosity Krebs: 123 [ASTM D562]
Brookfield 6rpm: 34,000 [ASTM D2196]
Tensile Strength 173 psi [ASTM D2370]
Enlongation Initial: 323% [ASTM D2370]
Post 1,000 hrs Xenon: 122%
Tear Resistance 82 [ASTM D624]
Permeance 4.9 [ASTM D1653]
1,000 hours: Pass, no change
[ASTM D4798]
Low Temp Flexibility Pass, -15°F after 1,000 hrs Xenon
[ASTM D522]
Water Swelling 7.8 after 7 days exposure [ASTM D471]
Wet Adhesion 7.3 [ASTM D903]
Fungi Resistance 0 rating [ASTM G21]
Typical Service
-30°F to 200°F (-37°C to 93°C)
Application Temp min. +50°F to 105°F (ambient)
Drying Time
(Touch dry) 1–4 hours at 77°F
@ 40% RH
Full Cure 7 Days


All documents are U.S. English unless otherwise noted

Commercial Roofing EagleView Commercial Property Owners Portal Architects And Specifiers


Product Princing and Where to Buy
© Copyright 2019 GAF | Privacy Policy and Legal | GAF Canada | GAF U.S.