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 the 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 an electric drill and Jiffy mixer allow to stand overnight outdoors. This mixture will solidify into a rigid foam which can be disposed of as 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). The 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