Handling/Installation Guideline: 3M™ Holdfast 70

Available Cylinder Size & Expected Coverage

Surface Preparation

For best results, all surfaces to be bonded must be clean, dry and free from dirt, dust, oil, loose paint, wax or grease, etc.

Bonding Methods

One Surface Bonding

Use this method in less demanding applications. Spray the the most non-porous surface and bond within the 1-60 minute open time.

Two Surface Bonding

Use this method for permanent and more demanding applications. Spray both surfaces and bond within the 1-60 minute open timeApplication Temperature

For best results, the temperature of the adhesive and the surfaces being bonded should be between 60-80 degrees F. Temperatures outside this range may affect bonding range and sprayability.

Equipment Setup

Attach the the larger flare fitting end to the spray applicator and tighten the nut securely. Check to see that the applicator gun trigger stop/adjusting nut is fully locked against the trigger. Attach the other end of the hose, a smaller flare fitting, to the cylinder valve and tighten securely.

Directions For Use

1) Slowly open the cylinder valve and inspect the connections for any leaks. Tighten if needed.
2) Fully open the valve.
3) Unscrew the trigger stop/adjusting nut away from the trigger 3-4 turns and spray a test pattern. For more adhesive output, continue to screw the nut away from the trigger. For less adhesive output, screw the nut back towards the trigger.
4) Hold the applicator 3-10 inches away from the surface to be sprayed and apply a uniform coat of adhesive. Note: The smaller the spray pattern chosen in step 3, the closer the applicator gun will need to be to the surface.
5) Apply 1-3 even coats of adhesive. This will depend on the needed coverage for the bonding application.
6) Allow adhesive to dry until tacky and then apply sufficient pressure to ensure complete contact.

NOTE: Test the tackiness by gently touching the adhesive with your knuckle. If the adhesive transfers to your skin, it is too wet. If the adhesive is aggressively tacky and does not transfer to your skin, it is ready to bond. If the adhesive only has a very light tack, it is too dry and another coat of adhesive should be applied to at least one of the surfaces.

Drying Time

Dry Time is 1-4 minutes. Open time is 1-60 minutes.

Equipment Shut Down

For storage, screw the trigger stop/adjusting nut all the way to the trigger lock position. Turn the valve on the cylinder to the closed position.

Storage

Store product at 60-80 degrees F for maximum storage life. Higher temperatures reduce normal storage life. Lower temperatures may cause increased viscosity of a temporary nature. Rotate stock on a a "first in-first out" basis.

Cold Weather Precautions

The bulk adhesive in the cylinder will thicken as temperatures get colder. The propellants will decrease in pressure and effectiveness.

As such, store the cylinders in a controlled environment with temperatures between 60-80 degrees F. Keep cylinders off of cold, concrete floors and away from outside walls. Use heat belts or blankets that are approved for use with flammable adhesives to control the temperatures of the cylinders. Allow additional time for solvents and propellants to flash off when temperatures are below 60 degrees F.

If the cylinders arrive cold or have been exposed to cold temperatures resulting in poor performance, move them to an area that is heated above 70 degrees F. Smaller cylinders can be shaken or submerged in hot water to accelerate the warming process. Once the cylinders warm back to at least 60 degrees F they will perform as normal.

Precautionary Information

Refer to product label and MSDS sheet for health and safety information before using this product. For additional health and safety information, call 1-800-364-3577 or 651-737-6501.

The information and recommendations made in this document are based upon tests or experience the US Fabrics & 3M believe to be reliable, but the accuracy or completeness of such information is not guaranteed.