Wood preservative for planters

Penny_Forthem

Hub is planning to make some planters when he feels better.
He has asked if if any of you can recommend a good wood preservative please, for the interior surfaces, which come into contact with the compost.

Fairygirl

I just used what I had most of lying around, or didn't even bother apart from the top few inches, because they need lined with plastic anyway
I have a large tub of green fence paint which was too bright, and was usually mixed with brown or black for fencing. If I used any on the interiors it was that, to save on the more expensive black one that's on the outside. 

BobTheGardener

Do make sure you line them with something waterproof, like black plastic though, and slice through it above the drainage holes on the bottom of the planters.  Even if treated with the best wood preservative product in the world, wood in direct contact with soil won't last long..

Fire

I just use a basic Ronseal clear wood preservative - it's like water in consistency. I splash it on with a large paint brush. Two coats.

BarnPaint is also very good and very long lasting - no need to repeat the application for years.

Obelixx

If the wood grain and colour are good, just use Danish oil or Teak oil.  You could also try plain olive oil (for cooking, not extra virgin) mixed with the juice of half a lemon per litre.   Oil will bring up the grain and protect the wood but you will, as mentioned above, need to line the inside with black plastic to stop moisture form the compost penetrating and rotting the wood.  Don't forget to poke holes in the bottom for drainage.