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Bonding Urethane Rubber to Metal

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FAQ: I attempted to bond urethane rubber to stainless steel for an industrial application and it did not stick.  What can I do?
 

A.  Urethane rubber will not stick to some metals (for example;  brass or stainless steel) under any circumstances.  Urethane rubbers that exude an oil (such as PMC 121^tm WET or Reoflex^tm WET) will not bond permanently to any metal.

To get urethane rubber to bond to steel or other common metals, we recommend using a rubber that does not exude oil such as Vytaflex^tm, Reoflex^tm or Brush-On^tm urethanes.

 You can increase your chance of a secure bond between urethane rubber and metal by:

1.  Etching or sanding the metal surface.

2.  Clean surface with solvent (acetone) and let dry.

3.  Mix and apply rubber.

Options:

After step 2 above, spray a high quality SHELLAC onto the metal surface as a primer.  Shellac is a good bonding primer for urethane rubber.  Ure-Bond^tm adhesive is a better primer for bonding urethane rubber to metal and is available from Smooth-On distributors.