Newly Registered
Posts: 2
Joined: Sat Jan 14, 2006 12:24 am
Location: Zone 4a

Safe Sealant - What's Best To Waterproof Containers


In some cases I'm going to use terracotta pots for indoor plants, but also I'm going to use containers I've built myself -- small boxes with drainage, in which I'll have added a few worms.

Question: What is safe to use as a liner and sealant to waterproof those boxes.

I'd like to avoid plastic because it leaches. I don't trust glues generally, and I'm not sure about silicon either. Short of cooking up a big bowl of pine pitch in the back yard, for filling cracks and offering some protection for the wood, I'm stumped.

Thanks in advance for any opinions or advice.

The Helpful Gardener
Posts: 7491
Joined: Mon Feb 09, 2004 9:17 pm
Location: Colchester, CT

Wax is an old school sealant; worried about chemicals then use beeswax (kind of expensive...)

I use soil bags to line my coco fiber windowboxes, then cut them to where they don't show; works great... :D


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