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  1. 19th May 2009, 07:13 PM #1
    Arron
    Arron is offline GOLD MEMBER
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    Default Boat finishing - non-yellowing hardener.

    When i started this modest project (rowing skiff) I decided to plan for a paint finish - assuming beginners mistakes would be visible and best covered up. Now, as luck would occassionally have it, there doesnt seem to be any mistakes that really need covering up - its not perfect and there are some rough bits, but I can live with that for a first attempt. Now I'm starting to wonder if its really smart making a wooden boat and painting it to look like a plastic one. The problem is, I've not used the non-yellowing hardener - I've used the regular stuff. So where to go from here ?

    If the boat is kept inside a garage, and used about once a week for an hour or so, how long will it take for the epoxy to yellow ?

    Is there some type of finish I can put over the not-non-yellowing epoxy which will slow down the yellowing ?

    If it takes a long time for the epoxy to yellow, say 5 or 10 years, and if by that time I'm still interested in the boat but not happy with the dismal yellow colour, can I just paint over it ?

    cheers
    Arron
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  3. 19th May 2009, 09:46 PM #2
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    PAR
    PAR is offline Yacht Designer & Builder
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    Even "non-yellowing" epoxy will eventually yellow with UV exposure. Because of this, it has to receive a top coat, which can be paint or a clear coating of some sort.

    Clear coats can be as simple as oil based varnish or as fancy as LPU's. I've been using LPU's for a while and am pretty spoiled on their performance, but varnish will do as well, though you'll need to recoat sooner.

    So, if you leave the epoxy unprotected, not only will it yellow, but it will deteriorate, damaging the wood below as well. Prevention is a top coat with UV inhibitors, which again can be paint (the best protection) or a clear coat (not as well protected, but a lot prettier to most folks).
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  4. 19th May 2009, 09:50 PM #3
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    Boatmik
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    Happily with Bote Cote, most of the things that are used for the non yellowing hardener are in the standard one.

    So if you keep most of the UV away with some coats of spar varnish it will be absolutely fine.

    Best wishes
    MIK
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  5. 19th May 2009, 11:59 PM #4
    Arron
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    thanks MIK, thats a relief.

    Arron
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