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Thread: timber
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21st September 2020, 09:51 PM #1New Members
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timber
first time at this.Im making 40mm thick spotted gum entry gates and was advised to liberally coat with feast watson tung oil then coats of penetrol but I cant find anywhere that says that way. looking for advice.Cheers
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23rd September 2020, 09:27 PM #2Senior Member
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That’s interesting advice. Might work fine, but, fwiw;
1. Tung oil is not something I’d be using on all weather outdoor wood. It’s an indoor oil in my understanding.
2. penetrol seems like an expensive additional complexity here.
3. for gates, if not painting them, I’d use good quality marine spar varnish, minimum 3 coats. It’s designed to cope with salt water and sunlight as well as anything.
4. almost any finish will require at least biannual repair/touch up in Australian conditions.
hope that helps! And welcome!
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23rd September 2020, 09:56 PM #3GOLD MEMBER
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You'll be better off with an exterior oil finish if you like oil, and re-coated it once a year or there about.
Penetrol is just boiled linseed oil. It will disintegrate in the sun.
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24th September 2020, 05:39 PM #4
I would go with a simple oil finish. You could leave spotted gum unfinished if you do not mind it going naturally grey and your construction doesn't present rot spots and there is no sapwood, which will rot within a few years unless heavily preserved. You could use any good quality outdoor oil. I have used Diggers antimould linseed oil and it worked well, but the item is in shade. You must use a mould inhibitor in linseed oil for exterior use. If you want superior protection I would coat it every year or two with copper napthenate in a heavy oil, for example this one I have used TWA Heavy Oil Preservative - Preschem
It will send the timber a green colour for a few weeks but fade to a brown.
I have also used exterior grade varnishes on projects. They look nice for a few years but eventually degrade and become troublesome to maintain. As I get older I like to do things the easiest way so it is natural I would want to steer you away from varnishes. If your construction is easily sandable and not too many ins and outs then it might not be too much of a headache to sand back and revarnish at maybe 4-5 year intervals max. You might also consider talking to Bote Cote about their epoxy and how much maintenance is required. I have used it on a telescope base which by its nature will be no guide to a sun drenched structure!
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