alternative to epoxy for a strip boat

Discussion in 'Boatbuilding' started by TOALL, Jun 20, 2016.

  1. TOALL
    Joined: Jun 2016
    Posts: 23
    Likes: 1, Points: 3, Legacy Rep: 36
    Location: uk

    TOALL Junior Member

    Robins Timber are promoting a adhesive called Collano Semparoc. Apparently it has been developed for strip plank boat construction. Is this true and is it really worth considering.
    As a joiner my experience with pu glues tells me that although it will fill the gaps where the boards are tilted it wont add to the structure.
    I'm using speed strip to build a 50ft boat
    Its bound to be a lot faster and cheaper but I don't want to compromise the quality of the build.
  2. SukiSolo
    Joined: Dec 2012
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    Location: Hampshire UK

    SukiSolo Senior Member

    There's a perfectly good and probably cheaper alternative called resourcinol....;)

    Personally on such a large project I get advice from the n/a who designed it. My own preference would be resourcinol IF you can get tight joints or epoxy if you think you need the gap filling qualities. These are proven adhesives on large boats. There are a number of much smaller projects done with PU adhesives. I'd like to know how many (boats) are left at moorings etc and for how long etc etc before making a judgement call. It may be alright, I simply don't have enough first hand experience of serious structural PU wood joints in marine environment. The others I trust, but maybe someone else on here can fill in a bit more.

    BTW most marine ply (BS 1088) is glued with resourcinol, the giveaway is the darkish glue line. You can epoxy/glass sheath over any strips glued with another adhesive quite happily. Just keep well, well clear of any PVA based stuff....;)
  3. PAR
    Joined: Nov 2003
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    Location: Eustis, FL

    PAR Yacht Designer/Builder

    This is one of the newer polyurethanes on the market. It has the usual limitations of the polyurethanes, which are short storage once opened, foaming (depends on formulation), limited to no gap filling, etc., etc., etc. It costs about a dollar an ounce in the cartridge form, about $.6 and ounce in the liquid, while discount epoxy ($60 a gallon) is about $.4 an ounce, though you do have to mix it, but is wildly gap filling. On a cove and bead strip build, where gaps will be minimized, I can see where using this stuff might seem attractive.
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