We had a wooden DIY swim raft for about ten years when it eventually rotted away. No corrosion issues, as our longest-lasting attachment was 3/4"
manila rope.
The 60' hardware store chain that secured our boat didn't last as long, although parts were still as good as new and some stretches became paper thin. Much has been repurposed. Cutting is easy using a Harbor Freight hand-held grinder ($12).
Presently, there's 3/8" stainless chain that I bought from a Miami wholesaler that is securing a huge trampoline. The chain length I asked for was the last length on the wooden roll. The remaining four feet was not a practical length to sell, so I convinced the wholesaler to give me the last four feet for free...!
