The kubb sets are made from untreated green oak and need to be stored somewhere dry. There is no problem if they get left outside over night occasionally, but they should not be in damp conditions for too long. If wet, let them dry naturally before storing. The canvas bags I provide with each set are breathable, but if you use the optional wooden box, all items of the kubb set must be dry because air flow is restricted.
I am often asked if the kubb set should be treated. I like the natural look and oak weathers beautifully, but being an open pored timber it is susceptible to blackening and moulds, so I feel that a light oiling is a sensible precaution. Any Teak, Tung or Danish oil should be fine although I have started to use Oli-Natura Yatch & Teak oil, because I was attracted by their claim to use no nasty chemicals and it complies with safety standards for toys. I see no reason to treat the beech batons and I like the way they gain a well-used patina from handling and skittling over the grass.
The kitchen and craft items, if treated are finished with Oli-Natura hard wax oil and will benefit from occasional care and attention. I applied a single coat of wax, which dries to create an open-pored and breathable surface, so while you can wipe the food boards clean and wash them, you should dry them quickly and not leave them to stand in water.
Oli-Natura care instructions include their wood soap, which cleans and moisturises the wood, and their wood care wax for refreshing the finish (I have not used either yet, so I can’t comment on them). Over time, you may find that the surface becomes less smooth, as the grain becomes raised by moisture. If you prefer the original polished look, you can lightly sand the surface – I use a fine 240 grit grade of sandpaper – then reapply some food-safe oil or wax. If you decide to use other wood care products, just be sure to check that they are certified for use with foods and are allergy-safe. Alternatively, embrace the well-used and weathered look.