Before mixing NuMetal, clean off any loose debris, grease, oil, gasoline, rust, or dirt from surface. KBS Klean is the ideal surface prep. If you are using NuMetal in a pool, spa or pond repair, clean off any loose materials, algae, or slimy substances from the surface.

FOR BEST RESULTS, sand or rough up the surface to help improve the putty's adhesion.

NuMetal, that is cold or with a temperature below 70F, will be stiffer and slightly more difficult to mix and also take longer to set. NuMetal, that is warm or above 90F, will be softer and easier to mix but will have a shorter work life and set much quicker.

Allow approximately 30+ minutes for work time. NuMetal will begin to set in about 1 hour from the time mixing is complete and will be fully cured in about 12 hours.


  • Using a 1:1 ratio, cut only what you need. Simply cut equal parts of A and B bars using a ruler as a guide. It is much easier to mix several smaller quantities together than a large amount.
  • Knead and roll the NuMetal in your hands or on a clean working surface. To assist in making NuMetal more pliable or easier to knead/mix, wet your hands with water and work the water in as you’re mixing. Work at least 2 minutes for a walnut-sized piece; work at least 15 minutes for a whole pound. We suggest rolling it out so it approximates the shape of a cord or rope, then fold it in half and twist together. Knead the NuMetal back into a ball and repeat the process until the putty becomes one uniform color, making sure that there are no streaks of color.
  • Firmly press, shape or mold the NuMetal to the surface that you are repairing. For a very smooth, professionally looking surface and to eliminate the need for sanding, smooth and feather with WET fingertips BEFORE DRYING. Expect a steel hard cure in about 12 hours.
  • After curing, NuMetal can be sanded, drilled, routed, screwed, chiseled, surfaced, tapped, sawed, turned, filed, carved, stained or painted.


Securely seal any unused putty in the plastic zip bag supplied in the box. Clean all tools, reusable gloves, or any other used objects with soap and warm water IMMEDIATELY. If NuMetal adheres to these products after setting and curing, removal will be very difficult. When the job is finished, please remember to also wash your hands thoroughly with soap and water and especially before eating or smoking.


NuMetal has a very good shelf life. Always place any unused putty in the securely sealed plastic zip bag and store in a cool, dry location. Keep it on hand for use on additional repair projects in future months.

NuMetal Properties

Bond Strength (D1002): 375 psi

Tensile Strength (D412): 4,000 psi

Compressive Strength (D695): 12,000 psi

Coefficient of Thermal Expansion (TMA): 4x105

Dielectric Strength (D149): 300 volts/mil

Maximum Use Temperature: 250F

Hardening Time at 75F (D2471): ~60 mins

Shrinkage at 75F (D2566): None


Q. How can I smooth out the surface of my repair?
A. After firmly applying NuMetal to the surface to be repaired, use a putty knife or your fingers that have been dipped in water, and rub the application area until it forms a smooth surface.

Q. Can I use NuMetal as an adhesive?
A. Absolutely! NuMetal will bond almost anything to everything. It will bond wood, concrete, stone, plastic, tile, and all types of fiberglass and most types of metals. Whenever possible, rough up or lightly sand the surface to promote good adhesion.

Q. What is the highest temperature that I can use NuMetal?
A. The maximum use operating temperature is 300F (149C).

Q. What happens when NuMetal is cold?
A. It will be slightly more difficult to knead at first. However, the warmth of your hands and the slight warmth generated by NuMetal as its parts chemically react, will minimize this problem. Ideally, you should mix NuMetal at temperatures of 75F or above. Our putty will mix and spread out much easier at 80F rather than 50F. If NuMetal gets too cold, it will be more difficult to mix part A & B together and the hardening time will take much longer.
NOTE: Blowing warm air on the surface can help speed up the hardening time.


NuMetal Epoxy Instructional Videos

KBS NuMetal Used to Repair a Steering Wheel - Part 1 of 2

The first part of a video on how to repair a cracked steering wheel using KBS NuMetal Epoxy Putty.

KBS NuMetal Used to Repair a Steering Wheel - Part 2 of 2

The second part of a video on how to repair a cracked steering wheel using KBS NuMetal Epoxy Putty.