time between wet outs

Discussion in 'Fiberglass and Composite Boat Building' started by hardcoreducknut, Sep 3, 2012.

  1. hardcoreducknut
    Joined: Aug 2011
    Posts: 47
    Likes: 1, Points: 0, Legacy Rep: 27
    Location: USA

    hardcoreducknut Junior Member

    I wanted to start glassing the exterior of my hull, but don't have enough epoxy at the moment to start. I've postponed it until the batch I ordered arrives. I wanted to know what the max time between wet outs should be. A friend told me it's about 48 hours between the layers.

    I'm doing a stitch and glue with Raka non-blush epoxy and my interior panels are glassed already. I'd like to have another layer on the interior floor. Do I need to lightly hit it with some 40 grit sandpaper?

    Also, should I wait until the first layer gets tacky before applying my kevlar? My layup schedule is 6oz cloth + 5oz Kevlar + 6oz cloth in that order. I've attached a screenshot of my design. Overall length is 13' 10" with a 60in beam (48" bottom).
     

    Attached Files:

  2. tunnels

    tunnels Previous Member

    Why do you have a layer of glass each side of a layer of kevlar :?:?????:?:
     
  3. hardcoreducknut
    Joined: Aug 2011
    Posts: 47
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    Location: USA

    hardcoreducknut Junior Member

    Do you have a better suggestion given the design I attached? I guess I wanted to ensure that it would hold up to breaking 1" ice. We do it every year with polyester resin boats.
     
  4. tazmann
    Joined: Aug 2005
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    Location: California

    tazmann Senior Member

    I think a lot has to do with the resin used, I am using aeromarine epoxy resin and they say about 18 hours max re cote, I would check with Raka and find out
    I found going wet on wet is better or wait til first coat has hardened up with in the time frame to re cote, laying on top of sticky surface makes it tough to line up fabric once its stuck that and putting fresh resin on resin that is in it's curing stage didn't seem like the right thing to do, to me anyway
    Interesting layup with the Kevlar Have you done it that way before?
     

  5. hardcoreducknut
    Joined: Aug 2011
    Posts: 47
    Likes: 1, Points: 0, Legacy Rep: 27
    Location: USA

    hardcoreducknut Junior Member

    This layup schedule has been used in various places. Tollerboatworks uses it for their duckboats. The friend that has been helping me also used it for his drift boat that we take down whitewater streams fly fishing. Basically, after the cloth/kevlar/cloth you cover it with durabak (without the non skid) and it's essentially a tank at that point.

    I talked to raka and they said about a 48 hour recoat window. However, they also said that were that to expire, a light sanding and wipe down would work.
     
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