Acorn to Arabella: Glue Failure Problems

Alix and Steve of Acorn to Arabella are attempting to glue together the longer boards for their next step of planking Arabella. But an unforeseen hiccup has stopped their progress and made them question their processes up to now.  With a project like this, there are always going to be ups and downs.  The key is trying to stay upbeat and find a way around the road bumps. The “Acorns” were slowed down this summer by the unexpected work of figuring out the prop shaft assembly. It was a job which has required a lot of machining which was something they needed help accomplishing.

Now that they are back to the planking, they have discovered another issue.  The Resorcinol glue they bought for the planking this summer turned out to have gone bad, and now they are experiencing glue failures on planks they had been planning to install on the boat this week. The setback means they have time to really consider if Resorcinol was the right glue to use for the planks and planking process. They called up the TotalBoat Tech Team who sent out a few other options that they will test and explore as they decide it’s worth the extra time to find and use the right adhesive. 

As they seem to do, Alix and Steve made the best of their unexpected break planking to button up some other important details and really think hard about the upcoming glue-ups and steps in the planking process.

Enjoy today’s video!

 

15 responses to “Acorn to Arabella: Glue Failure Problems

  1. Resorcinol has an expiration date, usually 9 months. One has to be aware of this. The joints also have to be perfect. It is arguably the best glue for their application.

  2. Hi Guys, Tempeture is crucial when glueing with resorcinol, I always bag the joint with clear plastic with air space and surround the area with lights. That will give you the temp needed and also needs 24 hours to cure. It is the best glue for your application. Best time to glue is in the morning.

  3. No ribbands? This is a different process than I am familiar with. Butt joints are typical because the lap-joint is one of the strongest: depending upon glue to hold your planks together I would not recommend. 1/4″ is as thick as was recommended (see Gougeon Bros.)

  4. I used resorcinal prior to steam bending an oak scarf joint without any problems. I paid special attention to not overclamp and took two days to cure.

  5. Butt joints and backing blocks are how my old boat was built. Mahogany planking is still good after eighty years. Refastened a couple of times of course.

  6. Resorcinol glue requires high clamping pressure (150-175 PSI is not uncommon), and it also requires curing at elevated temperatures. Commercial laminators, like Sentinel Structures, use steam platens. Another factor is the moisture content of the planking. In the video, they show the crew resawing the planking stock then cutting the scarfs. Resorcinol requires a M.C. of 8-12%. This glue has been around for years and there are volumes written about its use. My 2¢ is that somebody didn’t do their homework.

  7. Seeing the glue is separating and leaving equal residue on each board after failure looks to me like the wood is absorbing the glue leaving the joint dry. I’ve seen this using clear (fiberglass) epoxy resin to glue up wood projects. I have much better results priming with resin then sanding and then gluing.

    1. Directly from CP Adhesives which sells the Aerodux 185. Wasn’t cure time. Glue was past its shelf life.
      We are also now using heat boxes around the joints to speed up the set time. Haven’t had any issues since the new glue and the heat boxes.

  8. I used Resorcinol since my father introduced me to it in the early 50’s when I was 5 years old or so. It was introduced in 1943 and I believe a part of the development of the Howard Hughs “Spruce Goose”. It is the glue used in bentwood furniture, which is what all the structural in the Spruce Goose looks like. It’s hard for me to imagine that the modern epoxies and urethane based wood glues would not be better that Resorcinal. I have had tremendous success with foaming urethane like Gorilla Glue, in marine applications. The pressure of the foaming action drives the glue into the wood. I reglued my entire teak strip swim platform back together after the original glue failed in 2004 and there is not a whisper of a crack. The platform is the original made in 1982. Gorilla Glue, and Gorgeon Brothers epoxy and fillers are my go to.

  9. I’m kind of shocked to see three guys cutting wood on a large band saw and none of them are wearing safety glasses. What are they thinking.

    Watching a bit longer I don’t see them wearing safety glasses ever. Kind of dumb don’t you think. And what kind of example is that to set? Eye doctors and safety engineers everywhere would be very upset

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