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whats the best way to waterproof very large untreTed oak planters, please?

Posts

  • Blue OnionBlue Onion Posts: 2,933
    Polyurethane?  Best to line them with plastic all along the inside too.  Are you growing flowers or veg?
    Utah, USA.
  • Mary370Mary370 Limerick, Ireland Posts: 2,003
    I line with empty compost bags 
  • FireFire North LondonPosts: 17,116
    When you say 'very large', how large?
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