Sash Windows - Exterior Clear Finish
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Wayne B



Joined: 06 Dec 2016
Posts: 1
Location: Adelaide, Australia

PostPosted: Wed Dec 07, 2016 6:28 am    Post subject: Sash Windows - Exterior Clear Finish Reply with quote

Disclaimer: I know the best way to protect timber windows long-term is to paint them, so please avoid posting replies to that effect. The windows in question are on my house, if they need extra maintenance, I can live with that.

I am in the process of restoring some old Australian cedar / Jarrah double hung sash windows. I have stripped, repaired and sanded the sashes and frame and the timber is just too beautiful to cover up! So I am planning to use a clear finish so we can enjoy the lovely old timber.

The windows are under a veranda and are completely protected from rain. They do get a little bit of direct sunlight on the sill and corner of the bottom sash for a few hours at the end of the day (probably not all year round). The majority of the windows never see direct sunlight.

I have some Cutek CD50 which from what I can gather is a naptha/parrafin based penetrating oil/resin popular for use on decks and exterior timber in Australia. I am planning to use this on the interior but I'm not sure how it will fare over the linseed putty on the exterior...

I am wondering if anyone has any recommendations for clear finishes to use on the exterior (preferably satin or semi-gloss).

Are penetrating oils/resins (such as the Cutek) and putty a bad mix?

Is a (long oil) Spar marine type finish a better option (such as McCloskeys Man O'War)?

I want to avoid polyurethane as I want to be able to maintain without stripping...

Please provide descriptions of finishes as well as brand or product names so I can find a local equivalent.

Many thanks
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johnleeke
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Joined: 20 Aug 2004
Posts: 2929
Location: Portland, Maine, USA

PostPosted: Sun Dec 11, 2016 4:47 pm    Post subject: Reply with quote

I strongly suspect that penetrating oil will wreck havoc with the putty. I suggest using a "spar varnish." This is a generic expression for an oil-based varnish made for the boat and marine trades.
I don't have a clue what products might be available there, since all my experience is in North America. I suggest you talk with the boat guys for a specific product. Feel free to post a product or two here and I'll take look at their technical info and let you know if it's what I'm talking about.

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