Stainless steel is sure to sink, and fiberglass is likely too as well. Unless you designed the system so they are supported by something, and not actually floating. Not sure if there are many different types of cork, but cork is also used to cork wine bottles and other liquids, and from what I've seen there, that cork dosen't seem to absorb those liquids. But I would need to ask some questions from those who make/sell the cork products to know it's property's for sure.
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