For dining tables Rockwood will cover the repairs of any natural flaws that may occur within 10 years of the date of purchase for indoor use only and all other products for the first 12 months.
Teak is extremely durable and doesn't need anything specific to help preserve it. But for personal preferences and aesthetics it may be necessary to clean (generally with soapy water), sand and reapply the preferred finishing.
We fumigate all of our containers to Australian Customs standards but we do not add any extra harmful chemicals to our Teak as it is generally unnecessary and can be dangerous, especially with children, animals and on any high touch surfaces (like furniture).