InstaGel 20 is a two-component urethane elastomer that is specifically formulated as a brush on molding compound. After mixing, InstaGel 20 thickens to creamy butterable gel that can easily be brushed on to vertical or overhead surfaces without sagging or running. In 24-hours InstaGel 20 cures to a tough rubber mold and is ready for use.

Application and Mix Ratio

InstaGel 20 is fully cured in 24 hours at 72°F. Colder curing temperatures will lengthen cure times. Warmer temperatures will greatly reduce working and cure times. For clean-up use methyl ethyl ketone (M.E.K.), acetone or mineral spirits.

Component A and component B are supplied in 1 to 5 gallon containers. Component B should be thoroughly mixed before using. Component A does not need mixing. Carefully measure out equal portions of component A and component B by volume in separate containers. Mix small batches by hand with a spatula. Larger batches should be mixed using a "Jiffy mixer" and electric drill. While mixing material carefully scrape down sides and bottom of container. Mixture gradually thickens over 3 to 4 minute period to a creamy butterable consistency. InstaGel 20 can also be mixed by weight: 100 parts A to 96 parts B.


Working Properties

Mix Ratio By Weight

100 parts A/ 96 part B

Mix Ratio By Volume

100 parts A/ 100 parts B

Viscosity @ 72°F (A Side)

2500 CPS

Viscosity @ 72°F (B Side)

1100 CPS

Viscosity @ 72°F (Mixed)

500,000 CPS


Part A:



Part B:





Working Life @ 72°F

9-15 minutes

Set Time* @ 72°F

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

9.23 lbs.

Weight/Gallon Part B

8.88 lbs.

Weight/Gallon Mixed

9.06 lbs.

Cubic inch per lb. of product


Hardness @ 72° F

ASTM 2240-85

20-30 Shore A

Tear Strength

ASTM D-624

94 lb./in.

Tensile Strength

ASTM D-412 die C

428 psi


ASTM D-412 die C


Modulus (100%)

ASTM D-412 die C

136 psi

Modulus (200%)

ASTM D-412 die C

209 psi

Modulus (300%)

ASTM D-412 die C

267 psi


Clean Up

Dispose of all empty InstaGel 20 component containers in accordance with local, state and federal regulations. Empty component containers can be rendered non-hazardous by rinsing the containers with a small amount of mixed material and allowing material to cure for 24 hours. The containers will then contain non-hazardous cured urethane.

Storage and Shelf Life

InstaGel 20 is shipped from the factory in sealed containers. The containers should be stored in a cool, dry area that is protected from direct sunlight and moisture. Storage temperatures should not exceed 80°F. The shelf life of the factory sealed containers stored under these conditions is six months. Containers that have been opened should be resealed immediately after material has been removed in order to prevent solvent evaporation.


Shipping Class: Class 55 Non-hazardous