Cumaru (Brazilian Teak) deck/steps exterior protection - Woodworking Talk - Woodworkers Forum
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post #1 of 2 Old 05-31-2016, 11:57 AM Thread Starter
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Cumaru (Brazilian Teak) deck/steps exterior protection

I need some advice from the wood experts here.

I installed some Cumaru decking, aka Brazilian Teak and applied some General Finishes' Outdoor oil (2-3 coats), link below. It wore off within 9-10 months. It's on my front steps and porch which are my primary means of entrance, so used daily, and it also gets afternoon sun. It has also turned an ugly shade of grey. I sanded a small portion with a 200 grit and the natural color returned very easily. Is there something else I should be using? I also heard these hardwoods are naturally oily, so does that mean that it wont absorb any application easily? Should I thin it with a mineral spirit to promote absorption? I'm not sure if varnish is a possibility as I dont like the idea of building up layers on top of the wood, and it will cause inconsistent wear since it's used daily and also maybe make it slippery? I'm in Boston.

I'm trying to sand it all off and re-apply or maybe use another product, anyone use Cabot's Australian Timber oil?
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post #2 of 2 Old 06-03-2016, 09:42 PM
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My decks are of Ipe, sometimes called Brazilian Walnut, and my results are similar to yours. I don't believe there is any penetrating product that will last long outdoors.

I use a Penofin product made specifically for exotic hardwoods like Ipe. I apply it about every other year, and after every application, the decks look great, but slowly fade to gray by the next season. The exception is a porch that is sheltered from sun and rain, and it looks good for years.

Any kind of varnish would be a mistake IMO.

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