Key Tough-Coat E90-78

Durable UV Resistant Exterior Clear Coating

KEY TOUGH-COAT E90-78 is a low viscosity, one component, UV resistant polymeric water-based urethane coating with excellent thermal shock resistance and outstanding mar, abrasion and chemical resistance. This one component (1K) pre-catalyzed, self-crosslinking coating does not require pre-mixing/activation with a second component, minimizing waste.

With a 30 minute tack-free time regardless of ambient conditions, this coating is ideal for applications requiring multiple coats per day and for high output
production demands. TOUGH-COAT E90-78 is quick-drying and ready for light use within an hour and full service use within 24 hours. The resulting coating is a full strength, tough and durable coating that makes it ideal for sealing and substrate protection. The water-based formula allows for easy solvent-free water clean-up.

Advantages and Applications

  • One Component, Self-Crosslinking
  • Low VOC
  • UV Resistant
  • Water-based formula
  • Low viscosity – self leveling
  • Wide curing temp range
  • Excellent thermal shock resistance
  • Outstanding mar and abrasion
  • Superb chemical resistance
  • Quick dry – multiple coats per day
  • Strong adhesion to wood & metal substrates
  • Easy solvent-free, water clean-up


Weight Per Gallonlb/gal8.6
ViscositySec at 77°F Zahn #250-57
Shelf Lifemonths12
Weight Solids%38
Volume Solids%37
VOC Contentlb/gal1.52
Boiling Point°C100
Drying Timemin15
Light Usehours24

Product Information Bulletin (PIB) and Safety Data Sheet (SDS) Downloads

Key Tough-Coat E90-78 (PIB)

Key Tough-Coat E90-78 (SDS)