I have a new antifouling (biodegrabable, cheap, easily applied) to test.  I will post a 100mm square piece of coated material to anyone who will hang it in the water and check it every couple of weeks and report back on progress. The report will consist of before and after photos and a description of how easy/difficult it was to clean.    If you can do this, please pm me at harryproa @gmail.com with details of where it will be hung.

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rob