Paint problem Aluminium boat

Discussion in 'Metal Boat Building' started by steve123, May 26, 2015.

  1. steve123
    Joined: Dec 2014
    Posts: 59
    Likes: 2, Points: 0, Legacy Rep: 20
    Location: China

    steve123 Junior Member

    Aluminium boat, the paint has gone milky after 2 years in patches also Orange Peel(Guess thats always been). Any ideas on cause of this problem please ?
     

    Attached Files:

  2. PAR
    Joined: Nov 2003
    Posts: 19,133
    Likes: 472, Points: 93, Legacy Rep: 3967
    Location: Eustis, FL

    PAR Yacht Designer/Builder

    Without a lot more information, it's difficult to make any recommendations, but the obvious questions are, what type of paint, what conditions has it lived in, etc. It looks to be some chalking, which might just buff out. Have you tried to buff it?
     
  3. Ike
    Joined: Apr 2006
    Posts: 2,249
    Likes: 189, Points: 63, Legacy Rep: 1669
    Location: Washington

    Ike Senior Member

    Who painted it? The builder or a previous owner?
     
  4. steve123
    Joined: Dec 2014
    Posts: 59
    Likes: 2, Points: 0, Legacy Rep: 20
    Location: China

    steve123 Junior Member

    No cant buff out, it was painted by the builder. There are 2 boats but only one gone like this, the other is fine. They were not sprayed at the same time, my impression is this boat was sprayed when humidity was high or someone dropped a can of thinners or something and tried cleaning up.
    Maybe they cleaned up wearing gloves as in one area it look like a glove or material print...contaminated cloth or something.
     

    Attached Files:

  5. PAR
    Joined: Nov 2003
    Posts: 19,133
    Likes: 472, Points: 93, Legacy Rep: 3967
    Location: Eustis, FL

    PAR Yacht Designer/Builder

    Why can't it be buffed? If it was sprayed, it was with a partly plugged gun or something, as that stipple looks worse than a lousy roll and tip job. If it was mine, I'd just repaint as the finish looks like crap anyway, in spite of the cloudiness.
     
  6. steve123
    Joined: Dec 2014
    Posts: 59
    Likes: 2, Points: 0, Legacy Rep: 20
    Location: China

    steve123 Junior Member

    This boat is 2 years old and this is only showing up now, the boat is in Holland so i can only go on what the client is saying that it wont buff out.
     
  7. steve123
    Joined: Dec 2014
    Posts: 59
    Likes: 2, Points: 0, Legacy Rep: 20
    Location: China

    steve123 Junior Member

    I have had similar milky patches on interior before that was due to spraying in high humidity.
     
  8. AndySGray
    Joined: Jun 2014
    Posts: 296
    Likes: 13, Points: 18, Legacy Rep: 91
    Location: Cayman

    AndySGray Senior Member

    PAR's right, it should improve by compounding

    May be a language barrier,

    Be specific;- ask them to gently hand flat, using some 3M P2000 or P2500 wet and dry with warm water an a little simple green, ideally somewhere inconspicuous.

    If it's modern 2 part paints, those are much harder than the traditional paints and using a basic cutting compound will hardly touch it, especially if done by hand.
     
  9. AndySGray
    Joined: Jun 2014
    Posts: 296
    Likes: 13, Points: 18, Legacy Rep: 91
    Location: Cayman

    AndySGray Senior Member

    The handrail in the second picture post is not likely a factory issue, not after 2 years

    I've seen something similar before - Are the boats on fresh water....
    with mosquito's....
    The common bug sprays with high levels of DEET will eat into the surface of some paint like paint stripper
     
  10. Mr Efficiency
    Joined: Oct 2010
    Posts: 7,903
    Likes: 336, Points: 83, Legacy Rep: 702
    Location: Australia

    Mr Efficiency Senior Member

    Is it aluminium ? Doesn't look like it. Maybe clear coated ?
     
  11. steve123
    Joined: Dec 2014
    Posts: 59
    Likes: 2, Points: 0, Legacy Rep: 20
    Location: China

    steve123 Junior Member

    Yes its Aluminium..more photos
     

    Attached Files:

  12. PAR
    Joined: Nov 2003
    Posts: 19,133
    Likes: 472, Points: 93, Legacy Rep: 3967
    Location: Eustis, FL

    PAR Yacht Designer/Builder

    Yep, that's my thinking too Andy. I'd start by roughing it in with a 1,500 pad, moving up through 3,000 and seeing how it looks. If you're real anal about it, pull out the 5,000 grit pad and have fun, before the fine polish comes aboard. I know some say you can't buff some of the LPU's but I'll be damn if I've found one yet, that doesn't respond positively to some surface smoothing, so long as it's fully cured and performed correctly (speed, products, etc.).
     
  13. mastcolin
    Joined: Jun 2005
    Posts: 146
    Likes: 13, Points: 18, Legacy Rep: 150
    Location: The Netherlands

    mastcolin Senior Member

    Has the boat been covered with a tarpaulin? This can cause this. You say the boat is in Holland...which implies it has travelled...which does actually imply it may have been covered over in transit

    pps it may not easily buff out. It can be sometimes 'deep' in paint ie too deep to get rid of without sanding with something like p600.
     

  14. SprayAway
    Joined: Jul 2015
    Posts: 4
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Manchester, UK

    SprayAway New Member

    Hi steve123, this looks like paint oxidization to me, perhaps the builder used a better priced 2k paint rather than a PolyUrethan paint.

    Ask the gent to spray hairspray on the area then take a picture as he doea it, then after it dries. If the paint goes dark during, it just need topping off with lacquer from a body shop, if it doesnt do anything then youre looking at repainting the sections.
    If the colour stays dark after the hairspray dries, then youre only looking at a cut and polish.
    Hope this helps :)
    Source: i spray paint boats
     
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.