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Thread: Bedding compound conundrum

  1. #1
    Join Date
    Sep 2018
    Location
    McLean, VA, USA
    Posts
    24

    Default Bedding compound conundrum

    I'm about to put together the built up stern of my Washington County peapod; basically 2" thick white oak sternpost, stern knee, and keel. I was planning on using Sikaflex 291. This is my first built up stem or stern. I've not used Sikaflex, and while I'm aware of the warnings that I won't be able to take apart the stern or stem for repair, I'm not sure what the chances are I would want to. I've never used this stuff before; any advice, tips, or tricks? Thanks.

  2. #2
    Join Date
    Jun 2003
    Location
    Central Coast, Ca
    Posts
    29,969

    Default Re: Bedding compound conundrum

    I have used a lot of it and like it
    I generously tape off the area around the joint, wait for it to go off then trim the excess with a sharp chisel and remove tape.
    It can be messy, keep a roll of toilet paper handy and by using and discarding one sheet at a time, immediately clean up as you go any that gets on you, your fingers and tools or soon you and your work will look like Brer Rabbit after fighting the tar baby.
    Black Sika looks the best with wood joinery... white looks like a mistake unless everything is painted.

  3. #3
    Join Date
    Nov 2011
    Location
    Salt Spring Island, BC
    Posts
    7,736

    Default Re: Bedding compound conundrum

    Also, Sika will do a superior job of excluding water from the joints which will mean that you will be less likely to need to disassemble them later.

    Regarding clean up, if you seal the non-faying surfaces before assembly you will be able to wash the smeared goop off with paint thinner without staining those surfaces. That won't matter though if you're painting. If you dry fit then plane/scrape and sand everything as though it were the finished product before disassembling, gooping and reassembling then most of that sealing can be part of the final finishing.

    I prefer rags to toilet paper or paper towels since Sika is so sticky and gooey that it just rips the paper.

    And yeah, black looks much better than white.

  4. #4
    Join Date
    Apr 1999
    Location
    Hyannis, MA, USA
    Posts
    49,846

    Default Re: Bedding compound conundrum

    Sneaky Flux is great stuff. I still miss the Challenge from the early days of the WoodenBoat Show.

    About worrying about taking it apart later - That's a "NOP". Next Owner's Problem.

    G'luck

  5. #5
    Join Date
    Jun 2003
    Location
    Central Coast, Ca
    Posts
    29,969

    Default Re: Bedding compound conundrum

    You need industrial TP like that stuff in a porta-potty that can double as sandpaper

  6. #6
    Join Date
    Sep 2018
    Location
    McLean, VA, USA
    Posts
    24

    Default Re: Bedding compound conundrum

    thanks for your recommendations. Yes, I'll be painting. Does this need a primer? I've seen a primer on the Sika website, but not always from actual boatbuilders

  7. #7
    Join Date
    Oct 2009
    Location
    South Puget Sound/summer Eastern carib./winter
    Posts
    18,973

    Default Re: Bedding compound conundrum

    "Sika" is a lotta differnt things, like "Cetol".
    It's a brand.

  8. #8
    Join Date
    Sep 2018
    Location
    McLean, VA, USA
    Posts
    24

    Default Re: Bedding compound conundrum

    Sika 291 was the game plan

  9. #9
    Join Date
    Nov 2011
    Location
    Salt Spring Island, BC
    Posts
    7,736

    Default Re: Bedding compound conundrum

    291 is what I was thinking but they may have one that disassembles more easily.

  10. #10
    Join Date
    Jun 2003
    Location
    Central Coast, Ca
    Posts
    29,969

    Default Re: Bedding compound conundrum

    Don't take it apart...

  11. #11
    Join Date
    Mar 2019
    Location
    Rushworth, Australia
    Posts
    702

    Default Re: Bedding compound conundrum

    Yes it does have a primer or several depending on materials to be joined. Email Sika they are very helpful.. I used 291 to join my ballast to keel and plug bolt holes. Itís sandable too.

  12. #12
    Join Date
    Aug 2004
    Location
    Victoria BC, Canada
    Posts
    584

    Default Re: Bedding compound conundrum

    If you're not worried about taking it apart, consider 3M 5200. It cleans up easily (before it cures) with mineral spirits. Whether mineral spirits will interfere with epoxy or something else is another issue, best read the manufacturer's information for the other product to find out.


    There is a lot of dislike for 5200 on the forum. Me, I like it as it does just what the makers say it will.

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