Gel coat blemish

Discussion in 'Fiberglass and Composite Boat Building' started by Sam III, Nov 24, 2008.

  1. Sam III
    Joined: Sep 2007
    Posts: 71
    Likes: 2, Points: 0, Legacy Rep: 46
    Location: League City, TX USA

    Sam III Junior Member

    We sprayed our hull mold today and have a small patch of gelcoat with alligatoring in one corner.

    Suggestions on how to fix this?

    Sam
     
  2. fiberglass jack
    Joined: Dec 2005
    Posts: 463
    Likes: 16, Points: 0, Legacy Rep: 95
    Location: toronto

    fiberglass jack Senior Member

    cut out the allagated area with a razor blade and carefully remove with out releasing the rest of the gel then brush on some gel over that area i like to mix the gel hot and let it sit in the cup for a little time to let it thickin up.

    other cure is to remove the gel and respray or fix the area after you pull the part from the mould
     
  3. ondarvr
    Joined: Dec 2005
    Posts: 2,476
    Likes: 294, Points: 83, Legacy Rep: 506
    Location: Monroe WA

    ondarvr Senior Member

    You're most likely past the point of needing more info but.

    Be carefull with the razor blade, if you cut into the mold it will stick on the cut line. What frequently happens is the edge of the cut gel coat will curl up slightly when you brush fresh gel coat over it, so letting it thicken before brushing will help reduce the edge curl, thickening the gel coat slightly will do the same thing.

    Mixing the the gel coat hotter (more catalyst) may change the color, so don't over do it.
     
  4. waikikin
    Joined: Jan 2006
    Posts: 2,354
    Likes: 124, Points: 73, Legacy Rep: 871
    Location: Australia

    waikikin Senior Member

    Hi Sam, I'd brush some extra gelcoat into the area & fix it when demolded, if you let laminating resin eat through the tripe it can/could stick up due to longer gel times/"bight" depending on your release system, also run a fan over your tooling after shooting the gel to shift pooling styrene fumes that can induce tripeing(alligatoring if my Aussie to US translations on) also your gel thickness might be a bit thin & you might be safer to blow the gel out with compressed air & start again, also corners(inside on the tooling) can be tricky to shoot, I often use a cup or blurter gun & will brush the gel that sticks in the cup into some hard to get to inside corners gently after the shot. all the best from Jeff.
     

  5. Sam III
    Joined: Sep 2007
    Posts: 71
    Likes: 2, Points: 0, Legacy Rep: 46
    Location: League City, TX USA

    Sam III Junior Member

    After demolding the boat, we have an area in the bow that the gelcoat is to thin.

    Suggestions on the repair?

    Thanks in advance.

    Sam
     
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