StyroSpray 151 is a two component, rigid, 100% solids (contains no V.O.C.), polyurethane elastomeric compound. StyroSpray 151, when fully cured provides for a hard durable coating or part, which is easily sanded, machined or painted using conventional methods. StyroSpray 151 is specifically designed to be applied with high-pressure application equipment or cartridge gun. StyroSpray 151 is recommended for hard shell coating of EPS foam (expanded polystyrene). StyroSpray 151 is specifically designed to create a smooth finish on EPS foam, greatly enhancing strength and durability of finished parts.

Application and Mix Ratio

Choose a work area that is free from visible moisture and capable of maintaining a temperature range of 70°F to 90°F. All surfaces should be clean and free of dirt and visible moisture before and during application. Coverage rate for one gallon of StyroSpray 151 is 53 sq. ft. @ 30 mils thickness. High pressure spray application is best done using different spray temperatures for components A & B. Component A at 72˚F and Component B at 150˚F.


Working Properties

Mix Ratio By Weight

100 parts A/ 87.79 part B

Mix Ratio By Volume

100 parts A/ 100 parts B

Viscosity @ 72°F (A Side)

175 CPS

Viscosity @ 72°F/150°F (B Side)

1287 CPS/140 CPS

Viscosity @ 72°F (Mixed)

731 CPS


Part A:

Clear Amber


Part B:




Off White

Working Life @ 72°F

2 ½ minutes

Full Cure* @72°F with humidity above 50%

24 hours

* Set time and Demold time depends on temperature and relative humidity.


Physical Properties

Specific Gravity (Part A)


Specific Gravity (Part B)


Specific Gravity (Mixed)


Weight/Gallon Part A

10.01 lbs.

Weight/Gallon Part B

8.79 lbs.

Weight/Gallon Mixed

9.40 lbs.

Coverage at 30 mil thickness per gallon

53 sq. ft.

Hardness @ 72° F

ASTM 2240

70-75 Shore D



Clean Up

Dispose of all empty StyroSpray 151 component containers in accordance with local, state and federal regulations. Mix Part A 1 Part to Part B 1 Part by volume then add about 10% water and mix with electric drill and Jiffy mixer allow to stand overnight outdoors. This mixture will solidify into a rigid foam which can be disposed of as a non-hazardous solid waste.

Storage and Shelf Life

StyroSpray 151 liquids should be stored in the original, unopened containers in temperature between 70°F and 90°F (24°C and 29°C). Shelf life of materials when kept in unopened sealed containers, at the recommended storage temperature is six months. Containers should not be opened until ready for immediate use.


Shipping Class: Class 55 Non-hazardous