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Failed soft spot repair  Bottom

  • Hey all,
    We did the Hobie resin injection procedure but with poor results. Any advice? I'm tempted to cut a batch out of the top panel, rebond the foam below, bond the top back on and add a few plies.

    --
    Bryan in Poplar Grove, IL
    Supercat 17, unknown year
    Hobie 16, 1977
    --
  • Several questions for you, as I am preparing a similar repair. 1) How big an area are you trying to repair? 2) What was the spacing of your injection holes. 3) Did you inject one hole until it oozed out the neighboring holes,then tape those holes off? 4) What epoxy were you using? 5) just how soft was the area? 6) what do you think lead to the poor results? Thanks in advance.
  • raisehullSeveral questions for you, as I am preparing a similar repair. 1) How big an area are you trying to repair? 2) What was the spacing of your injection holes. 3) Did you inject one hole until it oozed out the neighboring holes,then tape those holes off? 4) What epoxy were you using? 5) just how soft was the area? 6) what do you think lead to the poor results? Thanks in advance.



    1) I'll post some pictures and you can see.
    2) About 4".
    https://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=135236&g2_serialNumber=4
    3) I was not getting oozing in the neighboring holes, so I just injected as best I could in all of them
    4) System 3 like this: https://www.amazon.com/gp…asin_title?ie=UTF8&psc=1
    5) It seemed pretty soft. Not sure how to put a measure on it.
    6) The foam was wet!

    I decided to cut out a panel on the top. I practiced on a scrap from the old boat. That is a circle/straight line cutter tool for the dremel. Shown is circle mode. It uses a little router/cutter bit.
    https://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=135242&g2_serialNumber=4

    Here is the straight cut after I did the two half circle cuts on my hull.
    https://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=135248&g2_serialNumber=4

    Top popped off. The foam was wet!
    https://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=135251&g2_serialNumber=4

    We heated up the inside of the boat. Our hangar thermometer was removed from the wall and put in the hull. It read 120F after 10 minutes or so.
    https://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=135254&g2_serialNumber=4

    --
    Bryan in Poplar Grove, IL
    Supercat 17, unknown year
    Hobie 16, 1977
    --
  • I think they recommend the holes a little closer together but, if you got moisture, it prob good you opened it up. Looks like dremel makes you buy 2 of those adapter tools.
  • I didn't see any spacing here:
    https://www.hobie.com/for…iewtopic.php?f=18&t=1156

    This is the bit I bought at Lowes. Came in a single pack.
    https://www.amazon.com/Dr…it&qid=1626120991&sr=8-3

    --
    Bryan in Poplar Grove, IL
    Supercat 17, unknown year
    Hobie 16, 1977
    --
  • ok, but i mean that radius adapter for the dremel.
  • raisehullok, but i mean that radius adapter for the dremel.

    I bought mine 6 years ago at Lowe's Depot or somewhere local. You can still get them on eBay.
    https://www.ebay.com/itm/…&mkrid=711-127632-2357-0

    Also I agree that with the wet foam it had no chance to bond.



    Edited by waiex191 on Jul 12, 2021 - 08:02 PM.

    --
    Bryan in Poplar Grove, IL
    Supercat 17, unknown year
    Hobie 16, 1977
    --
  • If I wasn't so busy, I would ask to come down there and see what yer doin. I am about an hour's bike ride North east of you.
  • raisehullIf I wasn't so busy, I would ask to come down there and see what yer doin. I am about an hour's bike ride North east of you.

    I'll take lots of pictures. You are welcome to visit but this is a bad week - customer meetings and I actually have to go into work. What do you ride? I took my '89 FJ1200 in today.

    --
    Bryan in Poplar Grove, IL
    Supercat 17, unknown year
    Hobie 16, 1977
    --
  • I decided to use the hatch I cut out as the backup to close the hole I cut. It was more or less the right shape & size, plus it had some curve to it. I sanded off the gelcoat first. The things holding it in are clecoes, which we also use to build/repair airplanes.
    https://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=135268&g2_serialNumber=4

    I beveled off the edge of the cut and the foam. I used a right angle sander to do this initially, and finished up with a piece of 60 grit.
    https://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=135271&g2_serialNumber=4

    This is after bonding that part in. I made little duct tape handles to pull it into place. It is thin and floppy. Because I was impatient, I used 5 minute epoxy for this part.
    https://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=135274&g2_serialNumber=4

    There are a couple of plies on that first patch from the prior pictures, to make it all sort of the same level. Then I glassed in two plies, one on a 45 bias and one straight.
    https://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=135277&g2_serialNumber=4

    Next up: I need to bond in foam. Hope to get it higher than the deck and then sand it level with the deck. Then a couple of plies on top. Because we don't belong to the yacht club, I am not going to try and hide this patch.

    --
    Bryan in Poplar Grove, IL
    Supercat 17, unknown year
    Hobie 16, 1977
    --
  • Check out the latest at Joyrider TV! Hull repair:
    https://youtu.be/FCp_5_kfBiM

    --
    Bryan in Poplar Grove, IL
    Supercat 17, unknown year
    Hobie 16, 1977
    --

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