Other uses for zinc
When looking at a bunch of sailboats while shopping for ours, I noticed that the majority of older boats had rusty keel bolts. One actually had the top layers of the keel bolts flaking off, like beer bottle cap that were gingerly placed back on top. To prevent this, why don't we fasten a small zinc to each of out keel bolts?
The other thing I noticed were engine mounts. The engine mounts on older boats were usually rusty, which meant for a costly repair. Why don't we fasten a small peice of zinc to each engine mount? It would protect the mount and possibly the engine as well.
And I have to believe that the zincs used for such local applications would last a long time.
So there you have my question, why don't we use more zincs in more places?