EXPANDABLE FOAM USAGE WITH COLLISION DAMAGE REPAIRS

SUBJECT: EXPANDABLE FOAM USAGE WITH COLLISION DAMAGE REPAIRS (INFORMATIONAL) VEHICLES AFFECTED: 1993 "W" MODELS

When performing collision repairs or replacing some structural components on 1993 "W" model vehicles, it is important that the foam blocking material used for noise, water and dust control be replaced as well.

This foam material can be obtained in two different types, 1). a single part material, and 2) a two component material. Either material is applicable for replacement of the original production material, since both are a "closed cell material" and are not water absorbent.

The locations for this material are indicated on the attached illustration. Similar locations will be found on other vehicles.

SINGLE PART MATERIAL

This material is available from most local hardware or building supply stores under a variety of trade names. It is available in 12 to 24 oz. cans and includes a straw type nozzle for "hard to reach" areas.

PERFORMANCE CHARACTERISTICS INCLUDE:

0 Slow application rates, easy to work with 0 Low expansion rates, apply amount to fill void required 0 Tack free cure time = 45 minutes, full cure = 8 hours

TWO COMPONENT MATERIAL

This material has more of an industrial application, but ran be obtained (from the sources listed) in various quantities useful for collision repairs.

It is especially useful when filling "blind" areas (areas that can't be seen) that require the expansion of the material to ensure sealing.

PERFORMANCE CHARACTERISTICS INCLUDE:

0 Fast application rates, height pressure cans 0 High expansion rates, between 8 to 1 or 1 0 to 1 (See Note) 0 Tack free cure time = 2 to 4 minutes, full cure = 4 hours

NOTE: Our experiments indicate the following information;

TIME OF SHOT (IN SEC.) VOLUME OF FOAM (IN CU.IN)

3 Seconds Approx. 120 Cu.In. 5 Seconds Approx. 200 Cu.In. 15 Second Approx. 650 Cu.In.

The typical application would not exceed a 3 second shot.

NOTICE: DO NOT USE MORE THAN WAS NEEDED FOR REPRODUCTION APPLICATIONS!

Over application of this material in some areas of the vehicle may change performance characteristics and is not recommended.

It is recommended that a small amount be applied into a disposable container to become familiar with the rate of discharge and ensure proper mixing of both material parts.

Call the following sources for information on sales and distribution.

"HAND FOAM" KIT "FROTH PAK" KIT

FoMo Products Insta-Foam Products, Inc. 2775 Barber Road 1500 Cedarwood Drive P.O. Box 1078 Jolier, 11. 60433-3187 Norton, Ohio 44203 1-800-800-Foam or 1-800-321-5585 or 815-741-6800 216-753-4585

NOTE NAES DEALERS FAX TECHNICAL ASSISTANCE CENTRE FOR INFORMATION

As always, follow the manufacturers recommendations for application and safety.

* We believe these sources and their equipment to be reliable. There may be additional manufacturers of such equipment. General Motors does not endorse, indicate any preference for or assume any responsibility for the products or equipment from these firms or for any such items which may be available from other sources.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.