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Post by Telemachus on Nov 9, 2016 20:10:07 GMT
When new our boat had ordinary bitumen blacking. It fell off fairly quickly so we had the hull grit blasted and 2-pac blacking applied. That was August 2012. It should last 6 years plus but after 4 1/2 years we were getting a bit nervous so I decided we'd dry dock the boat and have a look / touch up the scrapes, which became "might as well put on an extra coat all over to prevent blotchiness". Well to be honest I wish we hadn't bothered. We ended up jet washing it, scrubbing off the residual growth and giving it a light sand with an orbital sander / 80 grit pads. This is what it looked like after doing that and before any new blacking was applied. Really, there was no need to do anything since there was zero rust, total adhesion even at the waterline and even no damage on the bow after a bit of ice breaking.
going to add some photos in a minute, they're "too big" to upload as they stand.
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Post by Telemachus on Nov 9, 2016 20:13:55 GMT
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Post by Deleted on Nov 9, 2016 20:23:27 GMT
It certainly looks in good nic, nick. How many anodes has it got?
We took ours out this year and blacked the hull and base plate, but think we have a distinct lack of anodes, something we may remedy in the future.
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Post by Telemachus on Nov 9, 2016 20:27:38 GMT
It had anodes front and rear (ie 4 total). When we had it blasted and 2-packed I thought that, since it wouldn't be out for 6 years, we'd better have another 4. However again, not sure we needed to have bothered since the original ones are only about 1/2 worn and the new ones hardly at all. Of course it's worth bearing in mind that the "sphere of influence" of an anode is not that great. They do however perhaps give early warning of electrolytic corrosion problems.
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Post by Deleted on Nov 9, 2016 20:36:35 GMT
It had anodes front and rear (ie 4 total). When we had it blasted and 2-packed I thought that, since it wouldn't be out for 6 years, we'd better have another 4. However again, not sure we needed to have bothered since the original ones are only about 1/2 worn and the new ones hardly at all. Of course it's worth bearing in mind that the "sphere of influence" of an anode is not that great. They do however perhaps give early warning of electrolytic corrosion problems. I guess more won't do any harm. I was always under the impression that the "sphere of influence" was only about 12 ft diameter, so on most longer boats there is a distinct lack of protection in the middle of the boat. I was thinking of getting some of the thinner anodes at some point (so they don't get caught in locks) welded in the middle.
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Post by cuthound on Nov 9, 2016 20:40:35 GMT
When I had DQ surveyed at 6 and a half years old, the 2 pack (painted from standard over Zinga from new) was in excellent condition.
She is booked in for an inspection next May, when she will be 9 and a half years old, so will be interesting to see how it has fared.
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Post by bettina on Nov 9, 2016 20:46:14 GMT
Oh Nick, I'm so happy you've created this thread and provided the pics to back it up.
We also have 2 pack and someone told us, shortly after we bought the boat, to expect getting 4 years out of it rather than the normal 2, which we were happy with.
Now I appreciate that you are a far more experienced boater than either of us, and it was on this boat that we both learned the art of steering, mooring & lining up for skew whiffy small bridge holes, which would mean, I expect, that ours has had a fair few more scratches, rubs and bumps over the course of the past 3 years, compared to what yours has had over the past 4; so not exactly comparing like for like. And then of course, we don't know if ours was applied to the same standard as yours.
Thank you for posting this.
B~
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Post by Telemachus on Nov 9, 2016 20:46:18 GMT
It had anodes front and rear (ie 4 total). When we had it blasted and 2-packed I thought that, since it wouldn't be out for 6 years, we'd better have another 4. However again, not sure we needed to have bothered since the original ones are only about 1/2 worn and the new ones hardly at all. Of course it's worth bearing in mind that the "sphere of influence" of an anode is not that great. They do however perhaps give early warning of electrolytic corrosion problems. I guess more won't do any harm. I was always under the impression that the "sphere of influence" was only about 12 ft diameter, so on most longer boats there is a distinct lack of protection in the middle of the boat. I was thinking of getting some of the thinner anodes at some point (so they don't get caught in locks) welded in the middle. I think mid section anodes will just hit things and get ripped off eventually.
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Post by bettina on Nov 9, 2016 20:48:58 GMT
When I had DQ surveyed at 6 and a half years old, the 2 pack (painted from standard over Zinga from new) was in excellent condition. She is booked in for an inspection next May, when she will be 9 and a half years old, so will be interesting to see how it has fared. Oh yes, please let us know the result cuthound
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Post by Telemachus on Nov 9, 2016 20:54:21 GMT
Oh Nick, I'm so happy you've created this thread and provided the pics to back it up. We also have 2 pack and someone told us, shortly after we bought the boat, to expect getting 4 years out of it rather than the normal 2, which we were happy with. Now I appreciate that you are a far more experienced boater than either of us, and it was on this boat that we both learned the art of steering, mooring & lining up for skew whiffy small bridge holes, which would mean, I expect, that ours has had a fair few more scratches, rubs and bumps over the course of the past 3 years, compared to what yours has had over the past 4; so not exactly comparing like for like. And then of course, we don't know if ours was applied to the same standard as yours. Thank you for posting this. B~ However we do a lot of locks - we enjoy them! And even if I can generally drive into a lock without touching the sides (when I paying attention and not glued to the iPad), once we whack open both paddles in quick succession (going up) the boat inevitably bounces off the sides a bit. So in summary there's been plenty of crashery but only the outside edge of the rubbing strakes get it. And even when they do, the stuff is so well bonded that it doesn't come off in chunks, it just abrades down a bit.
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Post by Telemachus on Nov 9, 2016 21:18:28 GMT
Anyway I should also mention that Telemachus has come home to Glascote basin - we are in the dry dock courtesy of Sarah of Norton Canes Boatbuilders who now runs the basin. Sarah and team have been nothing but friendly and helpful and seem to mostly do boat repairs etc (as opposed to building new boats), so I can recommend them.
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Post by ianali on Nov 9, 2016 22:11:23 GMT
Our boat has side anodes. Hasn't lost any in several years. 2 pack seems to be worth the extra costs and effort it seems.
Ian.
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Post by Delta9 on Nov 9, 2016 22:50:58 GMT
I guess more won't do any harm. Too many anodes can cause delamination of the blacking.
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Post by Deleted on Nov 9, 2016 23:17:39 GMT
I have basic bitumen blacking every two years since 2005. Next year will be our seventh blacking.
Being out of the water gives us chance to have everything checked out, and to do some painting.
As a bit of a whittler I think I'd be unsettled by 6 years between checks. Not saying it's bad, just I'm a worrier, sorry.
So ......is it cheaper to do the two pack and out every 6 years, than bitumen every two?
Rog
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Post by bettina on Nov 10, 2016 0:06:01 GMT
I have basic bitumen blacking every two years since 2005. Next year will be our seventh blacking. Being out of the water gives us chance to have everything checked out, and to do some painting. As a bit of a whittler I think I'd be unsettled by 6 years between checks. Not saying it's bad, just I'm a worrier, sorry. So ......is it cheaper to do the two pack and out every 6 years, than bitumen every two? Rog Pretty sure it would be for us in the WB as the cost of cranes in & out will be significantly more than a NB, as well as the amount of yards that have cranes big enough is somewhat limited taboot.
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