Originally Posted by fstbttms
Tin boosters are incompatible with non-TbT paints and my understanding that adding it to a copper-based paint for instance, will lead to adhesion issues.
Maybe "kill" is too strong a word.
Maybe "incompatible" is too strong a word also?
I've met many cruisers who add 3 - 5% (by volume) of TBT additive to brand name copper-based (and pesticide-based) ablative antifoul. They claim the additive doubles or triples the effective antifouling life with any adhesion issues. Works with hard antifoul paints too.
At some point, around 10% by volume, the TBT additive does lead to adhesion issues.
So there are trade-offs: a little organo-tin goes into the marine environment
; but less copper and pesticide goes into the environment
(because of a longer antifoul cycle halving the amount of copper, pesticide and related binders ablated into the ocean).
With respect to cargo ships, one story is that the TBT antifouling manufacturers were on the verge of reaching the optimum TBT antifoul formula (with matrix, binders, and TBT concentration that delivered maximum antifouling effectiveness with the minimum of TBT released into the environment). But then governments acted to ban TBT because of observed effects from the first generation of TBT paints, when the antifoul manufacturers had a higher concentration of TBT and a different set of matrix and binders.
The unintended consequence of the ban on TBT was to send cargo shipping
backwards two steps: fouling increased, leading to higher fuel
costs, a shorter antifouling cycle, and a higher spread of invasive species carried across oceans as fouling.
Note the general hypocrisy of everyone in the debate, including myself. I'm writing this on a PC powered by burning coal. Knowing that almost every chunk of coal burned adds mercury
into the air. And that most of that mercury
ends up as organo-mercury in marine food
chains. So if you or I eat marine fish
(or aquacultured fish
fed with fish meal), we're consuming toxic organo-mercury from coal-fired power stations (and iron smelting etc).