^ +1. Kwila bleeding tannin is normal. You need to let it bleed out before oiling or staining. I've seen (but never used myself) "new wood cleaning" products that say they remove tannin quicker. e.g., https://www.cabots.co.nz/product/cabots-new-timber-prep/
Looking at the ingredients one is just washing soda mixed with a type of detergent. Will have to be patient and give it a few months to cure and wash it well a few times in between rain. Luckily just dirt underneath and nowhere to run and ruin.
Hey @eva888 I can confirm the product I have used (here) has held up pretty well. My house and deck is in interior suburb of Auckland and not exposed to any salt spray or heavy out of ordinary weather issues.
When I wanted to treat the handrails for our new deck I had a hell of a time finding anything that would (a) still show the wood grain and (b) hold up over time. Eventually I phoned Resene and talked to a very helpful lady who said that the reason I couldn't find anything was that it didn't exist, there's nothing that will stand up to NZ's levels of sun/UV and weather for any longer amount of time. I was looking at some sort of varnish but she said I'd need to go with 5-7 coats of marine-grade but she wouldn't recommend that in terms of effort required vs. life expectancy, and the best option was to stain it. The stain degrades over time with sun exposure and will need to be reapplied periodically, it's essentially a sacrificial component that protects the timber, like sunblock.
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