Originally Posted by Bittentobuggery
Corrosion of the fuel tank would concern me if it's salt water.
I used to own a Ribtec 585 which suffered really badly from water ingress, with no apparent cause. Before commissioning a new 7.4m Ribtec from Tim Wilkes, I expressed my concern about water ingress and he told me they had solved the problem (and they had) but I am still none the wiser.
Fuel tanks are portable plastic jobbies under the bench seat so not prone to getting wet/corroded.
It seems from replies so far that it's a bit of a common problem, not something to be too concerned about (its not like you can sink a RIB that easily!).
And yes, I have checked the joins/seams between hull and tubes....
It must just materialise in there all by itself!