Ganyeka, I rather think the "problem" already has a solution. "Biobor" is a well known and readily available biocide that is used to combat the growth, any new product will only be a competitor to an already established market leader. (Prist is an anti ice additive, not a biocide)
If operators can't or won't be bothered to keep fuel tanks water free then they are unlikely to bother buying Biobor or any other product, so you won't win there.
It is not a thing I've ever encountered in 25 years flying from equator to almost the arctic circle, so I don't lose too much sleep over it.
the bottom of a plastic (fibreglass) boat. keep it in the water for three or more years and the gel coat starts to get 'eaten'
It does? As a plastic boat owner that's news to me! What happens to gelcoat at three years immersion? All gelcoat? Please tell more.