I have an extruded rubber fender
around my boat. Is is slided on onto a flange and hold in place by wood screws from the top and bottom.
Originally I was using 316 ss screws. After a few years (and a lot of offshore
sailing) the screws started to bleed rust. Especially near the lowest area of the fender
can accumulate. I assume this is happening because there is no oxigen where the screws enter the rubber.
I replaced the screws on one side with silicon bronze screws. Now there is some bronz powder around the bolt heads but no major (yet). And it does not look very nice.
I am concerned that with the bronze screws it won't be much better than with the stainless ones.