Epoxy Layers, Sanding, and Paint

Discussion in 'Wooden Boat Building and Restoration' started by Mr V, Sep 12, 2006.

  1. Mr V
    Joined: Dec 2004
    Posts: 20
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Central Kentucky

    Mr V Junior Member

    I am putting a good coat on the keel and bottom of my little 8 foot skiff. I have just put the first coat of epoxy on one side of the keel, as it is on it's side to prevent the epoxy from running off the sides of the keel.

    I have read through several topics on this and still have a question. In one place it states that you sand after the third coat, in another it says to sand after each coat.

    My questions are:
    1. Which method should I follow as I desire the best 'smooth' I can get, for a first timer at epoxy?

    2. I am actually doing a repair job on this boat. It started out with no epoxy finish, just ply and enamel latex paint. After an unfriendly move (^$#%#$ movers), my hull ended up with a crack, so I figured I would just epoxy the bottom of the hull and put a full size keel on it at the same time (Don't laugh, it actually looks good). I only sanded the paint off of the bottom of the hull and want to keep using this paint. Is my Enamel Latex paint going to stick to the epoxy after I get it all sanded down smooth?

    Thanks!
     
  2. hansp77
    Joined: Mar 2006
    Posts: 690
    Likes: 34, Points: 0, Legacy Rep: 200
    Location: Melbourne Australia

    hansp77

    as far as I know,
    First you should wipe down thoroughly the cured epoxy with metho to remove any blush (even if it is a non-blush epoxy).
    Then sand between every coat.

    Alternatively, and the method I have used is to wait for the first coat to go tacky, and then apply another coat- wet on wet. I think, this way the amine blush just follows on into the next reaction.
    I think you can do three coats like this- however, an expert will surely correct my errors...

    For painting, again, wipe with metho, sand, and then prime with a proper primer suited to epoxy, and to whatever your topcoat paint is.

    Hans.
     
  3. Toot
    Joined: Jul 2006
    Posts: 272
    Likes: 4, Points: 0, Legacy Rep: 17
    Location: Chicago

    Toot Senior Member

    Definitely sand any coat that has fully cured for a few days or more.

    You can just go on top of anything that hasn't cured for more than 24 hours or so.
     
  4. Mr V
    Joined: Dec 2004
    Posts: 20
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Central Kentucky

    Mr V Junior Member

    Just to make sure I am clear, what are you calling metho?
     
  5. hansp77
    Joined: Mar 2006
    Posts: 690
    Likes: 34, Points: 0, Legacy Rep: 200
    Location: Melbourne Australia

    hansp77

    metholated spirits,
    or thinners, or a solvent of some type.
     
  6. Mr V
    Joined: Dec 2004
    Posts: 20
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Central Kentucky

    Mr V Junior Member

    Got it! Thanks.
     
  7. BOATMIK
    Joined: Nov 2004
    Posts: 294
    Likes: 15, Points: 28, Legacy Rep: 190
    Location: Adelaide, South Australia

    BOATMIK Deeply flawed human being

    HI,

    There is a whole lot of different info here on my FAQ
    http://www.storerboatplans.com/Faq/faqindex.html
    suitable for getting an overview on how to use epoxy and get reasonable surface finishes as well as use the material efficiently.

    Best Regards
     

  8. JR-Shine
    Joined: May 2004
    Posts: 341
    Likes: 4, Points: 18, Legacy Rep: 54
    Location: Vero Beach, FL

    JR-Shine SHINE

    The best way to get a smooth finish is to apply many thin coats vs. a couple heavy coats. Using a foam roller cover, you roll an EVEN and thin coats. This will build up equal thickness all over the part. If you use a brush, some spots will have too much (sand it down) and other parts will not have enough (apply more) this adds up to a lot of wasted epoxy.

    Ideally, you roll on subsequent coats as soon as the previous is tack free, that way you dont have to sand in between - only the last one.

    Joel
     
Loading...
Similar Threads
  1. tonyg99
    Replies:
    6
    Views:
    1,572
  2. flyingvranch
    Replies:
    10
    Views:
    2,616
  3. RMMager
    Replies:
    14
    Views:
    2,597
  4. aaronhl
    Replies:
    11
    Views:
    2,902
  5. Skookum
    Replies:
    14
    Views:
    2,325
  6. abosely
    Replies:
    44
    Views:
    6,009
  7. Pete Cross
    Replies:
    0
    Views:
    921
  8. NoEyeDeer
    Replies:
    18
    Views:
    3,078
  9. samhaskins
    Replies:
    5
    Views:
    1,811
  10. TorBay
    Replies:
    3
    Views:
    1,418
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.