Advice please

[mock]

I have been asked to renew wooden slats on a cast iron bench with oak slats what would you recommend I use on the oak for exterior use Mock

 

[thetyreman]

Le Tonkinois varnish is good stuff

 

[mrpercysnodgrass]

Personally I would use nothing, allow the timber to breath and turn silver. Whatever you put on will eventually or sooner turn patchy then peel unless you cut it back each season and apply a fresh coat. If you must put a finish on it have a read of this excellent thread by RodgerM
https://www.ukworkshop.co.uk/thread...vs-sikkens-filter-7-plus.108601/#post-1478489