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Post by Jim on May 13, 2017 19:08:11 GMT
Oo er missus! Have you blacked the bottom of your boat, if so why, if not why not?
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Post by Deleted on May 13, 2017 19:15:30 GMT
I wouldn't bother blacking a canal boat on the bottom because it will get scraped off when going aground.
Maybe for a boat which never moves it might be worthwhile.
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Post by Mr Stabby on May 13, 2017 19:16:55 GMT
Mine's never been done. The surveyor did recommend that it should be, although there was less than 10% degradation after 30 years so it will outlast me even without it.
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Post by naughtyfox on May 13, 2017 20:47:25 GMT
Our hull surveyor (last July) said don't bother. So we didn't.
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Post by JohnV on May 14, 2017 7:00:53 GMT
Arriving at canal boating from another form of boating, I was truly flabbergasted when told that the bottoms of canal boats weren't painted.
I have heard the arguments as to why it is not worth while and remain unconvinced.
"There isn't enough oxygen a foot down" Pardon? how do the fish manage then?
"It all gets scraped off on the bottom" If you were scraping along the bottom that much it would wear the steel away. To the best of my knowledge it is only the chine or the turn of the bilge that becomes worn so why not protect the 95% that doesn't get scraped?
All my boats have the bottom painted. Including the only narrowboat I have been associated with (I didn't own it ... my girlfriend did .... I was just the mug that did all the work)
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Post by naughtyfox on May 14, 2017 7:05:02 GMT
I agree with that, and I would have painted our bottom but there was no time or opportunity. Perhaps in Summer 2018 I shall have a go.
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Post by Deleted on May 14, 2017 10:59:56 GMT
Unless you suspend the boat from a crane I don't see how you can paint the whole of the base anyway as it will be supported somehow.
I wouldn't walk under a boat hanging on a crane not even a really good one.
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Post by Deleted on May 14, 2017 11:01:18 GMT
They used to have devices which rotated a hull upside down but on a modern boat you'd need a lot of self adhesive velcro to keep everything in place.
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Post by JohnV on May 14, 2017 11:06:00 GMT
Unless you suspend the boat from a crane I don't see how you can paint the whole of the base anyway as it will be supported somehow. I wouldn't walk under a boat hanging on a crane not even a really good one. You use a big jack, lift 1/2" and move the steels/blocks at that end then repeat at the other end. a 60 ton* jack under the stem or the skeg lifts Sabina H without any problem ...... the other way is refill the dock move the boat a few inches then drain again. (* used to have my own jack for this but unfortunately it was stolen)
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Post by Deleted on May 14, 2017 12:09:04 GMT
I didn't know about jacking the boat up ! Obviously draining and refilling works in a dry dock but its quite a lot of agro and more time.
Thanks for explaining it.
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Post by Saltysplash on May 14, 2017 12:18:58 GMT
Unless you suspend the boat from a crane I don't see how you can paint the whole of the base anyway as it will be supported somehow. I wouldn't walk under a boat hanging on a crane not even a really good one. I asked this question when I first had to anti-foul my MFV, as the Keel would sit on 6 blocks in the dry dock. She was too heavy to crane. The previous owners answer was, "what gets missed this time gets painted next time as it will never sit in the same place on the blocks every time." So yes, I've always painted the bottom and will do when our current boat comes out.
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Post by peterboat on May 14, 2017 13:23:38 GMT
So do I it corrodes like all metal in water so paint it
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Post by Deleted on May 14, 2017 17:22:49 GMT
Another side to it is that most (not all) base plates on canal boats are considerably thicker than the sides. 10mm base and 6mm sides seems to be common.
so they will take longer to rust away anyway.
Kind of depends on the boat.
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Post by Mr Stabby on May 14, 2017 17:27:25 GMT
Another side to it is that most (not all) base plates on canal boats are considerably thicker than the sides. 10mm base and 6mm sides seems to be common. so they will take longer to rust away anyway. Kind of depends on the boat. Yes, my baseplate is 8mm and the minimum thickness the surveyor could find was 7.2mm, on a 30 year old boat, so while it's probably "best practice" it probably also isn't essential.
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Post by Jim on May 15, 2017 20:11:16 GMT
Yes there are 3 4" strips were the support beams are. Made sure we sat down a little further along so at least a small bit gets done on a 4 year cycle. Ce la vie.
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