primer help

Discussion in 'Fiberglass and Composite Boat Building' started by nordvindcrew, Oct 9, 2009.

  1. nordvindcrew
    Joined: Sep 2006
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    Location: Marshfield massachusetts usa

    nordvindcrew Senior Member

    This probably has been covered before, but I could use some concise suggestions. I have a 20' fiberglass rowing double that was laid up as seperate pieces in a mold and then asembled. There is no gel coat. As we used the boat, it became evident that changes in the bottom were necessary. I'm now in the process of laminating new panels for the bottom. They will be put together in tack and tape fashion, so there will be a lot of fairing to do. Specifically, I want a durable low tech primer to protect the hull and get it ready to be faired then painted. Faring material will probably be bondo because the cost is low and the boat is only in the water for an hour or so. Any thoights would be appreciated. Thanks
     
  2. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    Go to any automotive paint store and get sanding primer
     
  3. GG
    Joined: Jan 2008
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    Location: MICH

    GG offshore artie

    Duratech makes a high build primer and has been around for years and is good for above and below the waterline .Almost every boat co that i have ever worked for has used this product ( primer ) and it comes in white or grey.
     
  4. Eagle Boats
    Joined: Nov 2003
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    Location: NEW YORK

    Eagle Boats Senior Member

    G.G., I believe Gonzo is just as American as you and I. In addition, I have read many of his posts, and he very knowldedgeable.
     
  5. keith66
    Joined: Sep 2007
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    Location: Essex UK

    keith66 Senior Member

    I think the question of marine or automotive products is a subject for itself!
    The Two Gigs i built a few years ago were cut & extended from far older boats, they were built very much on the cheap & were faired with P 38 (Bondo, Car Pud) They live out of the water on trolleys & get used regularly by people who despite our best efforts are not always as careful as they should be!. If they had been faired with expensive epoxy & two pack paint i would cry every time one of them bumps a jetty & gets scratched on the beach or slipway. They are patched up twice a year & are painted with oil based house paint.
    On a boat that was built like yours i would initially apply a few coats of Durabuild as its easy to fair & get a good finish.
    Lets face it a rowboat will often spend much of its life out of the water so whether or not the filler is waterproof is up to the owner & the boats intended use. If the boat is an expensive work of art by all means use the best materials!
     
  6. sabahcat
    Joined: Dec 2008
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    Location: australia

    sabahcat Senior Member

  7. apex1

    apex1 Guest

    You probably would´nt build one single boat if you would have the obligation to build to European standards! That much on that issue.:(
    And whats wrong with the auto primer? Do you keep your car in the bedroom all year round?:?:
     
  8. sabahcat
    Joined: Dec 2008
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    Location: australia

    sabahcat Senior Member

    No, but I keep my boat in the water all year round.

    The overall cost of the primer and topcoat is a very small price compared to the endless hours of prep prior to application, I would hate to have to sand failed crap off and do it again for the sake of saving an initial couple of hundred dollars.

    Using polyurethanes and epoxy primers primarily aimed at mining equipment, Aircraft and commercial shipping is far far more affordable than the same or similar product being aimed at the pleasure boat market, and the end result speaks for itself.

    [​IMG]
     
  9. nordvindcrew
    Joined: Sep 2006
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    Location: Marshfield massachusetts usa

    nordvindcrew Senior Member

    more info

    Just to give a little more information about how this boat get used: Trailered to the racesite, usually gets dragged about on the beach which often is nothing but rock. Landings are always to the beach, again usually rocky. Not uncommon to slide right over a submerged rock. In short the boat takes a beating. All I'm looking for is a primer that won't peel off and is a good base for the fairing and top coat, both of which will be low cost, low tech and will need to be re-done often.
     
  10. apex1

    apex1 Guest


    So, then:
    :D
     
  11. nordvindcrew
    Joined: Sep 2006
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    Location: Marshfield massachusetts usa

    nordvindcrew Senior Member

    subject closed

    It sounds like automotive sanding primer is the way for me to go. ..thanks for the opinions and ideas
     
  12. Herman
    Joined: Oct 2004
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    Location: The Netherlands

    Herman Senior Member

    One of my boats ended up in acrylic car paint instead of marine pu paint, and it was much more durable and scratch resistant...

    never submerged for long periods, however. My boats were trailer queens...
     
  13. apex1

    apex1 Guest

    What I say..............
    `cos that was the original statement: >>>and the boat is only in the water for an hour or so.<<<
     
  14. Herman
    Joined: Oct 2004
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    Location: The Netherlands

    Herman Senior Member

    I had a terrible fight with the guys from Akzo that supplied the paint. They would not allow me to put it on a boat. Even after explaining that the boat would only be in the water for a couple of hours.

    How many hours does your car spend in the rain?
     

  15. apex1

    apex1 Guest

    How many years do our cars spend in salt spray? We both live close enough to the sea that we have salty air at least during half of the year. Does that harm our cars paint?
    Of course Akzo Nobel likes to sell the marine stuff (at twice the cost).
     
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