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  1. #1
    Join Date
    May 2019
    Location
    Sydney
    Posts
    1

    Default Restoring a red cedar spa

    Hi guys,

    wondering if you may be able to assist. I have an old spa which is clad in what i think is red cedar. i sanded and stained it with a cabots outdoor furniture product last year. looked kind of ok but a year later it's pretty ordinary. see pics attached. just wondering what is the best way to bring this back. Thinking of a diluted hydrochloric acid solution to try and clean the timber (no idea what the black is) then a sikkens semi solid stain.

    any thoughts or observations would be appreciated.

    cheers

    andrew
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  3. #2
    Join Date
    May 2007
    Location
    Sth Gippsland Vic
    Posts
    4,355

    Default

    Try some Oxalic acid first. Its sold at Bunnings now .

  4. #3
    Join Date
    May 2011
    Location
    Albury
    Posts
    3,019

    Default

    The timber is almost certainly Western Red Cedar. It's a timber from the East Coast of the US, not to be confused with Australian Red Cedar.

  5. #4
    Join Date
    Nov 2012
    Location
    Brisbane
    Posts
    1,809

    Default Exterior timber

    Agree with both of the above. The black is most probably a mixture of oxidisation of the timber and resin as well as quite possibly some blue-green "algae" (not regarded as an alga any more but that is what most people know it as, if at all).

    I have also purchased the oxalic acid on eBay as a white crystalline powder. If you aren't confident mixing it you can buy ready-made solutions under various trade names such as Dekswood, from most paint shops, though its much more expensive that way it is certainly more convenient.

    If you want a natural-look oiled finish you could look at a marine oil called Deks Olje (available from Whitworths) that you put on wet-on-wet until the timber is saturated. I have found that lasts best out of all the uncoloured decking oils. Any timber out in the weather needs to be re-coated about every six months if oiled, though the pigmented oils can stretch that out to a year. Exterior paints will easily last 10 years, so are the lowest maintenance.

    David

  6. #5
    Join Date
    Apr 2015
    Location
    Brisbane
    Posts
    304

    Default

    We have spa with similar looking timber. It was my parents so fairly old. Last year I sander to bare timber and coated with marine varnish from Bunnings. Time will tell how long it lasts.

  7. #6
    Join Date
    Dec 2005
    Location
    South Australia
    Posts
    4,470

    Default

    I have only ever use Aussie clear on my spa after 10 years still looks good

  8. #7
    Join Date
    Nov 2012
    Location
    Brisbane
    Posts
    1,809

    Default

    Hi China,

    What is Aussie Clear? Is it an oil or a polyurethane - other? How exposed to the weather is the spa? The exposure and UV levels make a huge difference to the longevity of a finish. My boat has a simple marine varnish inside (paint outside) but it is almost always enclosed with clears and canvas, so very little UV. Still needs refinish after 5 years!

  9. #8
    Join Date
    Dec 2005
    Location
    South Australia
    Posts
    4,470

    Default

    It is a oil I have used it twice in ten years and yes my spa is semi undercover https://preschem.com/products/timber.../aussie-clear/

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