[gunsequalfreedom]

It all depends on the application requirements. The corrosion problem you rightly warn about is only a problem if the product being repaired will last longer than the negative effects of using a penny for a washer instead of a washer.

For example, in the case of a repair to a General Motors car, the penny will certainly outlast the car.

Chevy Vega

[ROCKLOBSTER]

The Vega wasn’t a bad car, once you put a real engine in it.