HydroArmor® 7755 is a sprayable latex coating designed for use on aluminum, fiberglass, cold-rolled steel, galvanized steel, and most metal primers. HydroArmor® 7755 is formulated to give very good corrosion protection when applied as thinly as 20 mils wet. This low viscosity, sag-resistant coating can be easily sprayed onto exposed underbody areas and into restricted areas such as tubing and "hidden" areas accessible only with spray wands. Wet film builds of 30 mils or more can be applied without runs, drips, or sags.

Product Type: Coating, Latex, Waterborne Adhesive, Waterborne Coating

Compatible Substrates & Surfaces: Aluminum, Fiberglass, Galvanized Steel, Metal, Steel

Features: Corrosion Resistant, Good Sagging Resistance, Low Viscosity

Technical Data Sheet
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Identification & Functionality

Features & Benefits

Ready-to-Use Product Features
Product Highlights
  • Our lab tests of HydroArmor® show this coating is extremely durable under even the worst service conditions:
  1. Several days at 121°C (250°F) and immersion in acidic and caustic solutions did not affect the dried film.
  2. Rocks bounced off the coating when test panels were subjected to the “Gravelometer” at -34°C (-30°F).
  3. After 1500 hours in the salt spray cabinet, the HydroArmor® coating remains intact and there is no corrosion under the coating.
  4. HydroArmor® dries quickly at ambient temperatures and will withstand urethane paint bakes after only 30 minutes dry time at room temperature.
  • HydroAmor® is as safe to use and as easy to clean up as latex house paint.
  • HydroArmor® provides better protection than any of the competitive products we’ve tested without environmental and safety problems inherent in many of the undercoatings available today.
  • Easily sprayed onto overhead and vertical surfaces to seal joints

Applications & Uses

Compatible Substrates & Surfaces
  • As with any coating, all loose dirt and rust should be removed before application.
  • HydroArmor® is designed to be applied with airless spray equipment. We recommend that a minimum of 20 wet mils be applied for optimum performance. We have sprayed this product with a 30:1 airless pump with a Graco airless spray gun. With this equipment, we can spray at 40 to 50 pounds air pressure using spray tips with orifi ces from 0.015” to 0.027”.
  • HydroArmor® resists water wash-off after air drying 30 minutes at 45 - 55% relative humidity; if not baked, it dries through in 24 hours or less (drying is slowed by high humidity and poor air circulation).
  • Until HydroArmor® dries, overspray can be removed and equipment can be cleaned with water. Dried material can be removed with Methyl Ethyl Ketone.


Typical Properties
ValueUnitsTest Method / Conditions
Specific Gravity1.44 - 1.50--
Solid Content69 - 73%-
VOC Content10 - 13g/L-
pH9 - 10--
Technical Properties
Property Value
Freeze/Thaw Stability: ASTM D 2243;
4 cycles to -29°C (-20°F)
Sprayable after hand mixing

Technical Details & Test Data

Test Data
The following tests were performed on panels coated with 15 dry mils of material after drying 21 days, at 20°C (68°F), and 50% RH
SAE J400 at -34°C (-30°F)
Slight chipping of coating
No penetration to substrate
No cracking
No loss of adhesion
Effects of Heat Aging:
ASTM C 792; 14 days at 70°C (158°F)
Flexibility maintained
No cracks
No loss of adhesion
Cyclic Fog/UV Exposure
ASTM D 5894: 16 weeks
No loss of film strength
No corrosion or bubbling
No loss of adhesion
Salt Spray Resistance:
ASTM B 117; 1500 hours
No loss of film strength
No corrosion under coating
No loss of adhesion
MVSS 302
Self-extinguishing within 1”

Packaging & Availability

Regional Availability
  • North America