Remove single pack paint applied to two pack substrate

Discussion in 'Materials' started by WhiteDwarf, Feb 4, 2012.

  1. WhiteDwarf
    Joined: Jun 2011
    Posts: 131
    Likes: 5, Points: 18, Legacy Rep: 80
    Location: Sydney

    WhiteDwarf White Dwarf

    I need to repaint a plywood dinghy (Jack Holt Heron). The original but tatty paint job was two pack Northane. It was overcoated with single pack International.

    To apply another coat of two pack, I need to remove the single pack.

    Can anybody recommend an alternative to getting down and sanding it?

    Thank you.
     
  2. Mr Efficiency
    Joined: Oct 2010
    Posts: 8,498
    Likes: 473, Points: 83, Legacy Rep: 702
    Location: Australia

    Mr Efficiency Senior Member

    How about paint stripper ? You may get lucky and find one that attacks the one-pack ,and not the underlying 2-pack. Maybe a pressure cleaner to assist the process after the paint stripper has softened it up, scraping is hard work. Or just stick to the one-pack recoat, saves a lot of work and will look and perform well. I'd imagine dings in ply won't be any less noticeable in 2-pack.
     
  3. gonzo
    Joined: Aug 2002
    Posts: 14,281
    Likes: 589, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    Pressure cleaners have to be used very cautiously on wood. They can break the wood fibers and glue joints. A stripper may work, but you should consult the manufacturer for compatibility. It could deteriorate the Northane and make the finish coat blister and peel.
     
  4. michael pierzga
    Joined: Dec 2008
    Posts: 4,862
    Likes: 115, Points: 0, Legacy Rep: 1180
    Location: spain

    michael pierzga Senior Member

    Just sand , prime and paint.
     
  5. Mr Efficiency
    Joined: Oct 2010
    Posts: 8,498
    Likes: 473, Points: 83, Legacy Rep: 702
    Location: Australia

    Mr Efficiency Senior Member

    That would be the smart idea, I think, but sounded like he wanted to return to 2-pack. Trouble with that is the surface would need to be 100% free of the one-pack or turn into an ugly mess.
     
  6. michael pierzga
    Joined: Dec 2008
    Posts: 4,862
    Likes: 115, Points: 0, Legacy Rep: 1180
    Location: spain

    michael pierzga Senior Member

    Not always... take some two part thinner on a rag and wet an area of old paint. if the old finish wrinkles you must remove...if not sand prime paint.
     
  7. Mr Efficiency
    Joined: Oct 2010
    Posts: 8,498
    Likes: 473, Points: 83, Legacy Rep: 702
    Location: Australia

    Mr Efficiency Senior Member

    So there are one pack paints that aren't attacked by the two-pack solvent ? Any idea which type(s) ?
     

  8. WhiteDwarf
    Joined: Jun 2011
    Posts: 131
    Likes: 5, Points: 18, Legacy Rep: 80
    Location: Sydney

    WhiteDwarf White Dwarf

    Mr. Efficiency, you are spot on, I plan to go back to two pack. If I sand off the single-pack, I will have to completely eliminate the material, including any particles left behind in the abraded surface.

    Michael's suggested use of thinners, might achieve the necessary removal.

    Thank you, all for your suggestions.
     
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.