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Proven adhesive / epoxy products that work on our hulls
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Author:  Robie [ Tue Aug 14, 2018 12:38 pm ]
Post subject:  Proven adhesive / epoxy products that work on our hulls

I am starting my journey to get fully informed on maintaining, repairing and sailing my 2 Hobie Island boats.

I was hoping fellow pilots could share first hand experience with using structural adhesives and 2 part epoxies.

If you could carry 10 oz. of one product on a 5 month trip in the wilds,What would it be ?

Your thoughts an links are appreciated

Author:  pro10is [ Wed Aug 15, 2018 9:52 pm ]
Post subject:  Re: Proven adhesive / epoxy products that work on our hulls

Hobie kayak hulls are made out of polyethylene. This plastic is very tough but polyethylene is notorious for being extremely difficult to successfully bond with most adhesives. Most such repairs will fail.

The closest adhesive I've found which has limited success with polyethylene (depending upon the application) is Loctite Epoxy Plastic Bonder. It's basically epoxy with a bit more flexibility and a plastic chemical bonding agent. JB Weld and other adhesive manufacturers also sell similar versions of it. I would not rely on this very long for a permanent hull repair, but it may serve for a temporary repair in an urgent situation.

Author:  ILean2 [ Sun Aug 19, 2018 4:37 pm ]
Post subject:  Re: Proven adhesive / epoxy products that work on our hulls

I'd take 100 mile an hour tape and reapply as needed takes up little space is cheap and sticks to anything. used it on long canoe trips with great results if it starts to lift rip it off and replace and go again.
Just my thoughts cheers

Author:  Robie [ Mon Aug 20, 2018 3:23 pm ]
Post subject:  Re: Proven adhesive / epoxy products that work on our hulls

Curious if 3M 5200 is any good 18 dollars for 10 oz. ?

5200 10 oz. Marine Adhesive/Sealant
4.6 out of 5
(30) Write a Review
Questions & Answers (20)
Soft and flexible formula that holds up to salt water
Designed for use in both wet and dry locations
Easy to apply using a standard caulking gun
$17.97 /each

Author:  pro10is [ Tue Aug 21, 2018 8:21 am ]
Post subject:  Re: Proven adhesive / epoxy products that work on our hulls

Robie wrote:
Curious if 3M 5200 is any good 18 dollars for 10 oz. ?

5200 10 oz. Marine Adhesive/Sealant
4.6 out of 5
(30) Write a Review
Questions & Answers (20)
Soft and flexible formula that holds up to salt water
Designed for use in both wet and dry locations
Easy to apply using a standard caulking gun
$17.97 /each


Although 3M 5200 is rated for polyethylene, it has a relatively poor shear strength of only 48psi when used with it. 5200 is one of the best marine adhesive sealants I know of, but not much sticks to polyethylene. Not to mention 5200 takes days to fully cure, although there is a "quick" cure version of it.

3M 5200 Performance Properties:

Image

Polyethylene is extremely difficult if not nearly impossible to properly glue.

Author:  Roadrunner [ Sat Sep 01, 2018 9:10 pm ]
Post subject:  Re: Proven adhesive / epoxy products that work on our hulls

Robie wrote:
I was hoping fellow pilots could share first hand experience with using structural adhesives and 2 part epoxies.

If you could carry 10 oz. of one product on a 5 month trip in the wilds,What would it be ?
I've used a couple of products successfully on Hobie's HDPE -- Loctite 3035 and 3M DP 8010. I've also used several other adhesives that have failed to bond under stress. Here's what it looks like:
Image

Anytime I try an adhesive out, I also run a sample to assess the strength. Here's the 3035 bonding 2 Hobie sample PE disks that I tried to separate with a chisel. As you can see, they didn't separate.
Image

I've used both of these products on high stress (drivewell and cam columns) repairs and limited bonding surface area projects with no problems. Of the two, the 3035 is slighely easier to work with because it uses a 5:1 ratio rather than the 8010's 10:1 mixing ratio. It's also a newer product that replaced a very good Loctite 3030.

You have to get these at an industrial supplier like RS Hughes (or Amazon). They're not cheap, they have a shelf life and they are not exactly easy to work with. Work life is about 4 to 5 minutes. They should be used outside and should not contact your skin. Other than that, they are great!

Here are a couple of small projects:
This drivewell insert is bonded to the drivewell plug for easy removal using DP 8010:
Image

This is a drivewell streamline project with 3035. These inserts are only held on place by their edges and are solid and stable:
Image

So far, nothing else I have tried has bonded well. 8)

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