Mostly its because of moisture, UV rays, and oxygen. Take a nice boat and put in a pitch black cave in a vacuum chamber and it’s going to stay pristine. Now go bounce it on waves and and drench fiberglass, stainless, copper, plastics, glue, woods, glass, wires, leather, chrome, and many other components, then leave it to bake in the sun, repeat, repeat,, oh wait, it’s raining that lightly acidic rain from smog, maybe you got some salt in the air because you’re near the Gulf, or an ocean… get the idea? It’s a harsh environment and all the molecules are being attacked by the elements over and over.
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