αναρρίχηση / climbing
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The sector akronafplia below the castle, although not interesting for climbing anymore, is an excellent natural lab for testing the corrosion of bolts in sea cliffs because it is an old crag, 4m away from the sea with an enjoyable approach, which contains both standard stainless steel bolts and glue-in bolts, often in routes next to each other.
A walk in the promenade below the cliffs and the results are pretty convicing: Almost all the non glue-in bolts are completely rusty and 100% unsuitable for climbing. All the glue-ins are nice and shiny and seem safe for climbing.
This leads to the conclusion that the biggest advantage of the glue-ins is that the epoxy resin acts as an insulator between the metal and the rock, which is what it is that eventually leads to the corrosion.
Go and see
Rock vs. Metal: 1 - 0