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247

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Posts posted by 247

  1. 6 hours ago, jddevel said:

    Mine was done on a hull March 2019 ( Boat first in the water August 2018-after sailaway fitout). About 5 months later noticed a blister about 50mm in size on the waterline below the shower outlet. Spoke to their office and they told me to return with the boat to sort out but not to worry as the coating underneath the blister would still be OK. Due to lockdown have yet to be able to get the boat back to them as it`s a 10 day oneway journey. Was expensive but their response to my issue was good. Will see what the hull is actually like when I can get the boat back to them.

    I'd be interested to know the outcome when you do manage to get there. 

  2. 10 hours ago, Dr Bob said:

    No, I just went for the normal blacking. It seems to work well and control corrosion and I like the idea of taking the boat out of the water every couple of years. You may not do this if it were two packed.

    The update is that we have just sold the boat and it's regime of normal blacking ( blacked in Aug 17 and May 19 ) has worked well with the sale survey showing no degradation in pitting etc. The survey from May 17 was almost identical to the new one in Mar 20.

    We have bought a new boat and that has been blacked normally. Despite my knowledge of epoxy coatings, I think I'm happy to get the boat lifted every couple of years to check for problems. 

     

    Thanks Dr Bob. I was happy with normal blacking for a decade but now have pitting. I did stop in a marina for a bit, with a galvanic isolator, so no idea if that had an effect or not. Imfortunately I'm on the next stage of the boating learning curve now, and leaning towards Debdale.

  3. 10 hours ago, Tim Lewis said:

    It might help if you were to ay where your boat is, I can give you the name of a yard in Watford that does shot blasting and two pack but that is no good if you have a wide beam in Leeds!

     

    I couldn't see a field for continuous cruiser. Currently  in the NW but that isn't a big problem. Want to get it done next year, by which time I could be anywhere. Narrowboat so no constraints.

    54 minutes ago, IDS said:

    I'd recommend debdale zinc spraying. Did our 1988 hull about 7 years ago. 

    Thank you. I'm seriously looking at that option, so it's really good to get feedback.

  4. On 07/07/2020 at 06:41, Nut said:

    welcome to the forums the answers should come thick and fast after everyone has a tea/coffee/gin etc and woken up

    Thank you Nut. Still hoping for more answers. How long does it usually take for everyone to imbibe tea/coffee and wake up? Gin? For breakfast? Might try it but I quite like porridge.

    On 07/07/2020 at 06:49, mrsmelly said:

    Pinders.

    Thank you.

  5. On 14/06/2017 at 18:24, Phil. said:

    If it helps our boat was done at debdale, zinc and two pack two years ago. Last month it was out of the water to change the prop and the surface still looked in mint condition. I know it is only two years in, but we do cruise 500/600 miles a year so we are happy with it.

    Useful info, thank you. I wasn't filled with confidence by the person I spoke to on the phone, but have read on this forum that the guys doing the work are good. What was your experience with the work and the office/communication?

    On 13/06/2017 at 23:29, Dr Bob said:

    I've not looked at the technical details but epoxy blacking must be refering to 'Coal Tar Epoxy' which is a proven marine coating system used on oil rigs in the North Sea. It is basically a high performance 2 pack epoxy (the best material for a barrier coating over steel) blended with coal tar - a bitumen type material used in traditional blacking. The coal tar helps give a bit of flexibility to the inherently brittle epoxy. Coal tar epoxies have been the coatings of choice for splash zone coating offshore as they have a limited amount of tolerance to water contamination on a surface altough the normal surface preparation is to grit bals to SA.25 standard - ie pretty damn clean. Nothing is ever dry in the splash zone of an oil rig!.

    I imagine these coatings are now being used in conjunction with zinc so that if there are defects or damage, the zinc will restrict further corrosion.

    Good for narrowboats? Well yes, but expensive. If applied right ie surface grit blasted back to SA2.5 (old swedish standard) and coating applied at >15 deg C and at least 5 deg > dew point, and to the right thickness then that coating will last 10 years on the cut. Applied over zinc even better if there is a defect on the surface (a bit of oil or water) before spraying. ......BUT the big problem is that these coatings are still pretty brittle and with some people out there thinking Canals are a contact sport, there is bound to be siginificant damage which will cause cracks. These coatings work by stopping water and oxygen reaching the steel and so no corrosion. If cracks appear, due to damage, then water and O2 get in and corrosion will occur at that site. The zinc will help passivate but will it work for 10 years? I wonder if the warranty covers the intact coating but is invalid in an area where the boat has had a bang.

    Coal tar epoxies will be expensive but the biggest cost is the blasting to get to pure steel and then applying the coating in adequate coating conditions - ie May-Sept. It is even worse when you start with a boat that is blacked. Not easy to get back to pure steel.

    I used to be tech manager of a speciality coatings company - and we developed a novel coal tar epoxy contaning rubber - but that was ridiculously expensive!

    I have just bought a 15 year old NB which needs blacking now. I'm just going to get the normal blacking done as I think there is too much potential to damage the coating hence the epoxy will not work as a barrier coating. Maybe the zinc will be the thing that makes this new coating work better. Maybe I will think about this product in 2 years time but I am not holding my breath.

    Hi Dr Bob,

    Did you go for zinc coating last year?

  6. On 24/11/2014 at 10:38, b0atman said:

    I have had my boat done at Debdale In April also had the epoxy finish plus anodes fitted . looks an excellent job .Time will tell .

    Only thing is have still not had any Guarantee paperwork when I contacted them in September answer was Mike is still working on it ? there was no mention of any free checks at 5 years .

    Hi B0atman,

    Im considering having my boat zinc sprayed at Debdale. Just wondering how your hull went on after this process and what it is like 6yrs down the line?

    I'd welcome an update from you.

    Thanks.

  7. Hi,

    My surveyor has recommended grit blasting of my hull, inspection of the base plate and pit welding on the sides, and base plate if required.

    1. Can anyone recommend a good yard to get this done at?

    2. Debdale Wharf offer zinc spraying. Has anyone had this done? In your experience was it worth doing?

    3. How do you touch up 2 pack epoxy once it starts to wear? (I've only used bitumen for the last 14 years). Do you just add another coat when it's due for blacking again?

    Thanks in advance.

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