My gut feeling after looking at it some more is that the 2 SS replacement brackets are what's rusting and causing the issue. I believe the bolts are already high grade 316 which is why none of the others are bleeding rust. I think the rust is forming on top of the flat part of the bracket and the bolt is simply acting as a conduit for the iron particles to creep through the bolt hole to the top of the platform. I can almost guarantee you put those same bolts in a bronze bracket the rust will cease to exist. Replace the bolts with new 316 bolts and the same thing will happen, the rust will return.
All that rust on the bottom of the platform didn't come from that 1/2" bolt.
I could be wrong, but I don't think so.
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Thread: Swim Platform Rust Stain Issues
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12-18-2023 11:35 PM #21Senior Member
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Re: Swim Platform Rust Stain Issues
Last edited by IOLANI; 12-18-2023 at 11:38 PM.
1986 54 Hatteras MY IOLANI
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12-19-2023 07:43 AM #22
Re: Swim Platform Rust Stain Issues
Hi, I installed a new swim platform on my 55C back in July. The fasteners are all 316 with Awlgrip painted on the portion passing thru to the platform. Then starboard between the brackets and the platform as well as the transom. Then large alum backing plates were fabricated on the inside of transom. Allbonded to the ship bonding system.
The brackets were then painted same as the running gear before it hit the water.
00E60F34-BA3C-447B-BDA5-EE71AE69DE7E.jpg
B5851DCD-D9D9-4DB8-9E04-84D8E817F18F.jpg
524596B8-5540-47DB-9242-6AED3AAEAC26.jpgLast edited by tkbsurf; 12-19-2023 at 07:49 AM.
"Sneaking Out"
1977 37C DD 6-71N
Jacksonville, FL
"Sneakin' Out"
1985 55C 12V71TI
Jacksonville, FL
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12-19-2023 06:33 PM #23Senior Member
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Re: Swim Platform Rust Stain Issues
Looks great. Unfortunately I think the anchor plates for my mounting hardware are imbedded within the transom. Looks to be no through hull hardware and even if there was it's not possible to access it. That is going to make running the bonding wires a challenge.
Perhaps I can drill one through hole in a location I can access and then daisy chain them together under the platform.1986 54 Hatteras MY IOLANI
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12-19-2023 10:32 PM #24Senior Member
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- Mar 2019
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Re: Swim Platform Rust Stain Issues
The alloy is called stain LESS, and not stainfree, for a reason. Wet stainless in the absence of air will rust. Its a fact. If you want to eliminate the rust you have to eliminate the wetting of the stainless or keep it oxygenated, both are tough to do. Blasted to white metal and epoxy coated (barrier coat) is certainly an option. Monel bolts as another option wont stain like stainless as they are mainly nickel. Coat the hidden parts of the stainless with a corrosion preventer such as tef gel. btw 316 ss bolts are marked as such in one fashion or another. washers usually literally stamped 316 nuts have a dot pressed in sometimes. the manufacturer wants to let you know what it is since it costs far more than 304
Last edited by bostonhatteras; 12-20-2023 at 10:09 PM.
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12-21-2023 07:27 PM #26Senior Member
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Re: Swim Platform Rust Stain Issues
1986 54 Hatteras MY IOLANI