What are they for? When do they get used?

What are the good/bad options?

My hull's due to be done, is bitumen just an inevitable evil or are there good and bad versions?

============= I live on my narrowboat with my cat, Bella.

What are the good/bad options?

"I've heard stories of fishermen in developing coutries mixing chilli-powder in with ordinary paint to use as anti-fouling. Reputedly works very well. Probably kinder to the environment than many "traditional" or newer anti-foul treatments."

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