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Thread: K5 polyurea bottom on Wooldridge Alaskan

  1. #1
    Member Hoyt's Avatar
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    Default K5 polyurea bottom on Wooldridge Alaskan

    I wanted to protect (and make it more slick) the bottom of my Alaskan. As it has a ribbed bottom, adding UMHW would be really tough, plus add a ton of weight. After doing a lot of research, with a couple guys from work (Wooldridge owners as well), we discovered K5 polyurea. If you havenÂ’t seen it or heard of it, do a google search and check out the videos that pop up. ItÂ’s an amazing product, having being used by the military for years as a blast mitigation coating. Anyway, we ended up finding out that Universal Welding in North Pole is a Vendor/applicator for the product. A couple of us guys decided to give it a shot. IÂ’m pretty happy how it turned out, and I hope it works well. Universal guarantees the K5 spray. We also added a top coat product called Wetlander (super slick silicone based coating they use on airboats). Universal agreed to apply that product on the K5 for us. The total weight added to my boat was around 50lbs, much lighter than UMHW. Also it required no holes or glue etc. I believe Phantom boats have mostly gone away from UMHW, and are spraying their boats with k5. I also talked with Wooldridge, and they said this would not void my hull warranty. Anyway here are a couple pictures of how it turned out. I cannot wait to get it on the rivers this year!







    "If I could shoot a game bird and still not hurt it, the way I can take a trout on a fly and release it, I doubt if I would kill another one." George Bird Evans

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    Member Akgramps's Avatar
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    That looks good, I have wanted to do the UHMW, except for all the holes, and the weight... Keep us posted, wont be too much longer.
    “Nothing worth doing is easy”
    TR

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    Member Sobie2's Avatar
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    Here in Juneau, I know a guy who put Wetlander on his sport jet powered home built 22'. It is slick stuff. So it works as advertised. What you don't get compared to UHMW is the impact resistance. So you will still dent your hull, but it will also slide around gravel and logs. Definitely a cost effective alternative. Good stuff.

    Sobie2

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    Looks pretty good. I would like some before and after pictures of the bottom after gravel bar sliding. I have researched the K5 and it seems to be bullet proof. What did they charge you?

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    Member oakman's Avatar
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    Quote Originally Posted by Sobie2 View Post
    Here in Juneau, I know a guy who put Wetlander on his sport jet powered home built 22'. It is slick stuff. So it works as advertised. What you don't get compared to UHMW is the impact resistance. So you will still dent your hull, but it will also slide around gravel and logs. Definitely a cost effective alternative. Good stuff.

    Sobie2


    This stuff looks pretty thick. I would think it should take a little abuse. I don't have any experience with this or UHMW though. What kind of impact can UHMW take without denting the hull?

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    Moderator bkmail's Avatar
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    The spray on polyurea is much thinner than uhmw and does not provide the protection of uhmw, nor is it as slick.
    The diff in thickness is obvious, as seen here as applied on an airboat vs a new roll of uhmw:


    We install uhmw on the bottom of jetboats all the time without drilling any holes, using our weld washer application method:


    The other is our thru hull bolts that leaves a completely slick bottom, nothing to catch on rocks and stretch the bolts. These are not plugs but a completely bonded uhmw applied around a carriage bolt.
    In short, the spray on works fine but its not a substitute for the uhmw if you have severe duty use.
    Also, it will be a bear to remove and really puts a kink in any future welding on the applied areas.
    I think its great for smaller boats, cost savings, etc.... but its not a substitute in my opinion.
    Bk


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  7. #7
    Member Sobie2's Avatar
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    Quote Originally Posted by oakman View Post
    This stuff looks pretty thick. I would think it should take a little abuse. I don't have any experience with this or UHMW though. What kind of impact can UHMW take without denting the hull?
    You can take a sledge hammer to a UHMW protected hull and not have any damage. Wetlander will adhere and flex to the hull but your boat will still get dented.

    Sobie2


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  8. #8
    Member oakman's Avatar
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    great info guys. Might have to think about this for my next boat!

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