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musa-
Pretty sure this is what we used. It takes a while to dry so best done on a good warm day.
Cuprinol 5122414 Uv Guard Decking Oil Exterior Woodcare, Natural https://www.amazon.co.uk/dp/B005A5NGJW/ref=cm_sw_r_cp_api_glt_fabc_WH6J4XEE96XZNDMMSGE2?_encoding=UTF8&psc=1
TGR
I used decking oil on ours. This was recommended by the retailer. 15 years later - no issues with rot etc and children all lived! Oddly, child safety was never mentioned/considered.