Wooden Patio Planter Lining or waterproofing?

[smc999]

I have started building myself a new wooden patio planter from some pallets I have got from work.
Previously I have painted them with fence paint and lined the insides with with black weed membrane stapled to the inside surface. I'm looking for other ideas
for lining the new one, I thought about stapling heavy duty plastic to the inside with some drainage holes at the bottom but I've seen some bituminous roof paint that I'm guessing is toxic and no good for veg. I also thought that maybe I could use some sort of liner like the stuff that top soil is delivered in.
Any help would be great.

[Jeanied]

I'd go for something that protected the wood at the sides but left the bottom open. Based on my experience of having green wood sleepers as raised bed edging - now rotting happily!

[BUFFS]

If you line it with thick plastic(got mine from a currys shop,they were glad to get rid of it) and drill good sized holes in the bottom,use the threaded top of a cola bottle araldited upsidedown(to be half inch proud) and use one of those green plastic scouring pads over the top of that,it stops the wood being constantly wet,after 3 years mine is fine and the half inch at the outlet means the plants can go quite a time without watering,i have some gooseberry bushes in mine and they dont seem to suffer at all....put the best soil/compost in you can ,not so much need for feeding or watering.

[smc999]

Thanks for that tip BUFFS.