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Old 12-05-2013, 12:30 AM   #21
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Originally Posted by Peter B View Post

...zincs still had half their meat left, as well - take note Art… So…all in all…pretty pleased
Hey Peter

50% zinc still there after 3 yrs - Congrats! That's great for salt water!

You must have low electric current in your area. In salt I usually need to replace zinc in 6 months to about 1 yr max. In fresh water with low electric current area zinc can still have some mass left up to 4 yrs. However, zinc in fresh water builds oxidation coating and requires wire brushing at least three times annually. Too much oxidation build up and zinc's anode quality can be greatly reduced or even nullified if left too long. Magnesium works well in fresh and needs no brushing. In salt mag evaporates too quickly and zinc flakes quickly enough so oxidation never builds.

Happy Launch and Boating Daze!! - Art
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Old 12-05-2013, 02:39 AM   #22
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Good stuff Pete!!

My turn next Tuesday. I will start a separate thread on Monday.
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Old 12-05-2013, 03:34 AM   #23
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As you guys know from previous posts I am a great advocate of Prop Speed and have been using it for about 6 years after many years of battling growth in the semi tropics using any and everything to treat the prop.
This stuff is just hard to beat, I think there may still be photos in my album on this forum from years ago supporting this.
Nice stuff Peter you must feel pretty good after that haul out , I suppose the antifoul was starting to loose its life after all that time.

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Old 12-05-2013, 02:01 PM   #24
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I see a lot of yards now spraying the props with a heavy coat of zinc paint. As well as shafts and underwater hardware. If marine growth stays off anodes would not it hold true for any metal item coated with zinc ?? Must investigate deeper. How bout zinc paint then coat with ArmorAll.
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Old 12-05-2013, 09:34 PM   #25
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Before changing to Prop Speed zinc painting was one of the systems that I had tried. About the same effectiveness as hard antifoul.
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Old 12-07-2013, 06:06 AM   #26
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Not so nervous now...

Ok guys, as promised, here be the after pics - note I decided to have a change of colour and went from blue to black antifoul, but for sure, Prop-speed back on the, well…the prop of course…oh yes, and the small hull blisters, there forever, had not changed...
Sorry a bit of sun glare crept into a couple…

Of course, as usual, costs escalated, hence the nervousness. In the end, thanks to the insurance surveyor, (also required), it needed new raw water seacock and strainer, (plastic strainer no longer allowed - ironic after it's lasted 33 odd years, but that's life), then new impeller, re-packing of stuffing box, finally the antifoul and Prop-speed...
Still, now I can rest easy...apart from the bills of course. Wife not impressed, as usual.
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Old 12-07-2013, 07:50 AM   #27
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Peter,
Looks good.
As my Partner says it is for my state of mental health so it doesn't matter.

You seem to carry a lot of zinc around the boat , have you had it tested as it would appear it is over zinced.
Some years ago I had mine tested whilst in water and as such reduced the zincs by 50% the next slipping and paint and underwater fittings have been a lot better and the zincs work well.

Nice to be back in the water isn't it.
Cheers
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Old 12-07-2013, 09:36 AM   #28
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Peter great picts, looks real good, nice bottom, glad all went well! Dem wifes - Geeeezzz! Maybe it's your boats pretty bottom that has your Admiral all a flurry! lol

Tidahapah - Interesting comment about over zinced: Not that I think my boat is... but how do you test for that? Is there a formula for ratio of anode compared to exposed diode in the water... or is it a galvanization/corrosion meter that tells the story while in the water? Must be different amounts per anode - vs - diode regarding immersion in Salt, brakeage, fresh waters... do you have a net address with scientific explanation on correct anode amounts?

Interesting topic... fastbottoms will probably have good input, hope he reads this thread.
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Old 12-07-2013, 10:10 AM   #29
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Art: We had a corrosion survey done this past July and it was well worth the $65 we paid for one hour. We've put Hobo in a marina, that's up a river, in brackish water and the summer rains hadn't really started yet. We wanted to see if our bonding system was in good order and that we didn't have any stray current in AC or DC systems.

The results showed that the bonding system and AC/DC systems were fine and we were within the recommended range of -550 to -1100 millivolt. We tested -635 millivolts. The technician suggested that even adding more zincs may not get us more negative because of the freshwater content potently increasing so he suggested that we switch to aluminum anodes. A week later after changing from zinc to aluminum anodes he retested. The reading was -1028. We changed out a 6" x12" x 1/2" plate, prop and rudder zinc all to aluminum. The change-over was ~$10 more.

Boatzincs.com has a carrion quiz that has some useful information.

Corrosion Quiz: Question 1
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Old 12-07-2013, 04:09 PM   #30
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Check out the corrosion site that Larry M has suggested.
Good info.
Cheers
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Old 12-07-2013, 05:27 PM   #31
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Larry - Cool link - TY. Put all its pages it in my corrosion book w/ my test meter. Always good to have more sources of info on this stuff!

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Old 12-07-2013, 07:20 PM   #32
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Pete, a modest work list after 3 years in the water. They look so good just before going back in the water.
Anyone think antifoul color affects fouling, or is it purely cosmetic?
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Old 12-07-2013, 07:51 PM   #33
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She's looking good Pete.

I was interested in Ben's comment on over zincing(not sure that is a word), I hadn't realised you could over zinc a boat. I do worry sometime about whether the copper bonding of the boat is still up to scratch though.
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Old 12-07-2013, 08:51 PM   #34
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I am still of two minds about this whole bonding thing. The seacock which was most corroded, and had to be replaced, was to my knowledge, the only one in my boat which is bonded. All the others are not, yet appear to be still pristine. Explain that. The engineer who replaced it was also a bit skeptical from his facial expression when I quizzed him about it. As to being over-zinced - maybe if most of your fittings are not bonded, being a bit over-zinked is good…? Puts me in mind of a song, (murdered a bit of course)...

Over-zinced - under-zinced, wombling free, the Wombles of Mor-e-ton Bay are we….

Oh and best of all. today I dunked the dink in the swimming pool at home, having taken it home while her mum is out of the water…got in with it so I could tip it in all positions and even look from underwater...and found the pesky leak which has been bugging me for months…! You beaut! Now just to slip on a hat, slop on some contact, and slap on a patch…and we're good to go...

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Old 12-07-2013, 10:26 PM   #35
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Very interesting boat stand, and I love the Celica GT4 all trac in the background.
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Old 12-07-2013, 10:52 PM   #36
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Quote:
Originally Posted by BruceK View Post
Pete, a modest work list after 3 years in the water. They look so good just before going back in the water.
Anyone think antifoul color affects fouling, or is it purely cosmetic?
Bruce,
I can't imagine black being anything but superior. Why would anyone put black paint on their yacht if it wasn't?

Seriously though .. a fellow in Craig Alaska was convinced that black was better. Some guys probably think engines run better if aligned to the magnetic lines of force of the earth and other such nonsense. But if there was more copper or other "active ingredient" in one color then of course that color would perform better but I'm fairly sure that's not the case.

Personally I'm not one for tradition but I've never put anything but red AF on any boat except my aluminum skiff and I had no choice there. Boaters these days seem to be painting the bottoms of their boats like new VW Beetle owners are painting their cars. At least boat owners putting weird colors on the bottoms of their boats are putting the offending bottoms promptly under water and out of sight. Never know when some critical guy like me will come along and be offended.

Spy that's peter's hot rod.
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Old 12-07-2013, 11:45 PM   #37
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Quote:
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Very interesting boat stand, and I love the Celica GT4 all trac in the background.
Yeah, I love it too, that's why I still have it 23 odd yrs later. Gave it a repaint last year - came up better than new…better paint technology I guess.
Sorry, but since yah menchined it…
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