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  1. 2nd February 2016, 08:15 PM #1
    tassietimbers
    tassietimbers is offline Senior Member
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    Default Black heart sassy joining/ finishing problem.

    Hi all

    A friend of mine made me a lovely 10 seater dining table from some black heart sassy boards I had in the shed for many years, perfectly dry and stable from ripper logs. Table has been fine for months, but the lacquer has just started to flake at a couple of joins, only an inch long or so. It is the same glues and lacquers used on hundreds of tables and various species prior with no problems. It is the end of the table we use and wipe with a damp cloth each day, just as we did the previous blackwood and redgum tables. Just wondering if anyone on the forum has any special tips for joining or finishing bh sassy in particular, or had these problems also. We think that somehow the joint has crept a little and moisture has got into and under the lacquer layer, but why with this species in particular?

    Cheers

    James.
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  3. 2nd February 2016, 08:32 PM #2
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    martrix
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    specifically, what glue and what finish were used?
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  4. 2nd February 2016, 09:18 PM #3
    tassietimbers
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    Default

    Just talked to my mate, and he informs me the glue was an aliphatic PVA (yellow in color), while the finish was 6 coats of Mirrortone pre-catalyst lacquer and 3 coats of Mirrortone pre-cat top coat with 10% gloss. It sounds like a foreign language to a bloke who knows chainsaws and sawmilling, but I hope it helps.

    Thanks
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  5. 3rd February 2016, 05:35 PM #4
    Arron
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    Most precat lacquers specify a maximum coating thickness which if exceeded will lead to cracking and crazing. It usually equates to 3 or 4 unthinned coats.

    Unless thinned pretty heavily or fully sanded off between coats, 9 coats of mirocat may be a problem.

    Not sure about this but certainly in contravention of manufacturers directions so worth checking out.
    Apologies for unnoticed autocomplete errors.
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  6. 3rd February 2016, 06:50 PM #5
    mark david
    mark david is offline SENIOR MEMBER
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    Default

    Quote Originally Posted by Arron View Post
    Most precat lacquers specify a maximum coating thickness which if exceeded will lead to cracking and crazing. It usually equates to 3 or 4 unthinned coats.

    Unless thinned pretty heavily or fully sanded off between coats, 9 coats of mirocat may be a problem.

    Not sure about this but certainly in contravention of manufacturers directions so worth checking out.


    Definitely agree,9 coats does seem excessive.
    The only spray finish I have Used is Becker Acroma DM307 30% on a couple of pieces and found 3/4 coats quite adequate.
    I am not convinced about the need or effectiveness of using 2 different finishes.
    The more coats you apply then the more likely it is to have an adhesion or contamination problem between layers.
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