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Old 21 June 2012, 15:49   #1
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cleaning SR4.7 hull

Hi chaps

Just picked up an SR 4.7 bare boat but it has been on a reservoir from new and has limescale on the hull. Can anyone reccommend a solution / cleaner to clean this off?

Cheers
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Old 21 June 2012, 16:28   #2
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Congratulations buddy!

I don't know about lime scale but I tried to polish a white hull for ages once because it was brown due to lake water, I couldn't shift it so I took it for a blast in the sea and it came back white
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Old 21 June 2012, 16:46   #3
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Here is a before and after picture of my old Valiant that had spend 5 years in a river without being taken out. I used Y10 and it did a fantastic job, just brushed it on then washed it off.
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Old 21 June 2012, 16:56   #4
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Snap - I also got hold of a SR4.7 earlier this year that had spent all it's life on an Oxfordshire reservoir and was covered in limescale.
The sailing instructors from the reservoir mentioned using brick cleaning acid but I was a bit concerned about the damage it may cause to the Hypalon and GRP.

I tried many different products but Starbrite Boat Bottom Cleaner worked best.

http://www.rib-shop.com/product.asp?...k=yes&P_ID=572

It is still hard work, I found the best way of doing it was to pour a small amount of the cleaner into a bowl and then using a small/medium size brush constantly work it in to the limescale agitating the brush all the time. Concentrated on a small area at a time, couple of hours per day for about a week but it removed all traces of the stuff. It took two bottles of Starbrite to get rid of it all.
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Old 21 June 2012, 16:57   #5
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Oxalic acid/wallpaper paste might work.


I think it's the same active ingredient as the starbrite? Either way, the acid won't damage the hypalon.
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Old 22 June 2012, 10:39   #6
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Another boat! Are you going for a mini armada down there.

Congrats Keith
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Old 22 June 2012, 12:21   #7
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Snap - I also got hold of a SR4.7 earlier this year that had spent all it's life on an Oxfordshire reservoir and was covered in limescale.
The sailing instructors from the reservoir mentioned using brick cleaning acid but I was a bit concerned about the damage it may cause to the Hypalon and GRP.

I tried many different products but Starbrite Boat Bottom Cleaner worked best.

http://www.rib-shop.com/product.asp?...k=yes&P_ID=572

It is still hard work, I found the best way of doing it was to pour a small amount of the cleaner into a bowl and then using a small/medium size brush constantly work it in to the limescale agitating the brush all the time. Concentrated on a small area at a time, couple of hours per day for about a week but it removed all traces of the stuff. It took two bottles of Starbrite to get rid of it all.
Thats where I have just got mine from so its exactly the same limescale!!
Thanks for your help, did you get the engine running on yours, I went for that one but you beat me to it !!
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Old 22 June 2012, 13:02   #8
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Quote:
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Congratulations buddy!

I don't know about lime scale but I tried to polish a white hull for ages once because it was brown due to lake water, I couldn't shift it so I took it for a blast in the sea and it came back white
Hi Whisper

Yeah well chuffed, it's nowhere near as clean as yours but all cosmetic. just needs a load of elbow grease and some gel repairs and it will look really tidy.

Unfortunately it has to go under wraps for a few months now until I finish my Attaque which is coming on really well. I have just put a complete new deck in and am moulding my new console next week. I will have to put some piccies on here.

Cheers mate
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Old 22 June 2012, 13:07   #9
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Another boat! Are you going for a mini armada down there.

Congrats Keith
Hey Alex

Yes finally got my 4.7, it's built like a tank!! Got loads of scrubbing to do if you and Sarah fancy a weekend in sunny Margate!! Only joking, catch up soon
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Old 22 June 2012, 13:09   #10
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Anybody know how to convince the wife that we do actually need two boats!!!
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Old 22 June 2012, 13:28   #11
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Thats where I have just got mine from so its exactly the same limescale!!
Thanks for your help, did you get the engine running on yours, I went for that one but you beat me to it !!
Engine cooling system was full of limescale and she did not want to fire up. It was sold as a non runner and although the engine wasn't seized I did not think it would have been an economical repair. So sold for spare parts.
With some TLC the boat is starting to look good, I will post some pics. when all is finished.
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Old 23 June 2012, 09:07   #12
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Woody73 - you'll need some type of acid to combat the lime. Brick cleaner is often Hydrochloric Acid at quite high concentrations. If it is diluted to approx. 5-10% it will have quite an effect on limescale but not damage the hull. Like the Oxalic Acid, it will quickly react with galvanised steel too, so be careful. Not the nicest thing to get on you either. Oxalic acid will remove staining from the GRP as well as remove the limescale. It is the active ingredient in a lot of GRP stain removers/hull cleaners.
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Old 24 June 2012, 04:49   #13
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come on get on with it

Them you'll be able to do this

The last picture is what your friends will be doing!
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Old 24 June 2012, 05:10   #14
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And this.....

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Old 24 June 2012, 05:18   #15
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Hi Alex

When Deja Voodoo is finished (I'm just 1 sizeable tax rebate away from that day)
it will have a Yammie f70 . I feel traitorous buying a four stroke, but it's going to happen.

I'd be very interested in going out with you on a run and comparing the lumps.

it will be before the summer ends if you are up for it

cheers stu
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Old 24 June 2012, 05:41   #16
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I feel traitorous buying a four stroke, but it's going to happen.
So you eventually came around to the idea!
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Old 24 June 2012, 06:51   #17
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No I haven't and I'm disgusted with myself! and I know I'm going to miss the smell and music of a two stroke

But I'm in a position nowadays where I'm finding myself increasingly wanting to do some instructing again, and I think a four stroke is going to be a more economical package for a school to hire.

The other thing is we just put an F70 on Jaspers boat and during the course of that I lifted it on to the transom which means it was well light. In addition the two of us jut nipped over to Cowes in the rough (combined passenger weight circa 220 kilos) and we did about 22 miles and used 12 litres of fuel.

If there is any redemption in this I've just bought trailer blokes 90 2 stroke for my 5.4 (Running on Empty)

Any way back to the thread and I can't say i blame whisper for not replying to a four stroke fool!
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Old 24 June 2012, 08:36   #18
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Sorry Stu, sorry I've been out shopping

If I had the money I would go for a four stroke

So it sounds like a Searider Gathering to me
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Old 24 June 2012, 09:30   #19
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Anybody know how to convince the wife that we do actually need two boats!!!
Do not under any circumstances let Rogue Wave know you have a garden capable of storing more than one boat
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Old 24 June 2012, 10:00   #20
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Do not under any circumstances let Rogue Wave know you have a garden capable of storing more than one boat


Talking of Gardens Iv'e just bought a sectional concrete workshop for mine now if only I could remember who it was I lugged the workshop they bought about for I could get them to give me a hand. I was gonna ask the day across the road but he hung himself yesterday
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