waterproofing a wooden planter

Wife has a couple of wooden planters that she wants to line with plastic sheet to protect the wood but I wonder if a spray product might be better. Flex seal, seen on tv, looks like it would work but it's too
expensive. Can I use a spray on truck bedliner product? The planters will have flowers, not anything that we would eat, if that makes a difference.
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On 7/27/20 10:18 PM, Obiwan wrote:

Would a small trash can fit by some odd chance?
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On Tuesday, July 28, 2020 at 6:24:19 AM UTC-4, Dean Hoffman wrote:

Fiberglass resin, thin, painted on with a brush. Could put in a few small PVC couplings or similar in holes in the bottom so that excess water can run out without rotting the wood.
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On 7/28/2020 7:21 AM, trader_4 wrote:

Wife likes that idea very much. We never worked with fiberglass before but it seems similar to epoxy.
Found this one on Amazon
(Amazon.com product link shortened)
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On 7/28/2020 7:42 PM, Obiwan wrote:

Might work but I would put in some fiberglass scrim to keep it intact from thermal expansion and contraction.
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On 7/28/2020 7:00 PM, Frank wrote:

I had to look up what is scrim. haha thanks
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It is epoxy. You can find it at HD, Walmart, etc
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On 7/28/2020 5:24 AM, Dean Hoffman wrote:

Not that I can see. These are about 14 inches wide and 32 inches long, sort of the shape of a horse trough, if you remember those from old westerns.
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On 7/28/20 3:42 PM, Obiwan wrote:

So get a larger bag and cut it down.
They range in size up to those big honkin' heavy duty 55 gallon mf'ers...or outdoor leaf/yard debris bags or even those contractor cleanup bags which are even bigger and heavier gauge ;-)
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On 7/28/2020 4:02 PM, Wade Garrett wrote:

She's opposed to any kind of plastic liner, such as garbage bags or the heavy plastic that we have in a roll. She wants something that she won't accidentally rip or poke holes in as she's gardening.
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wrote:

I have never seen that in 4 x 8 sheets ! .. so I checked-out Lowes <Canada > ...
https://www.lowes.ca/product/appearance-boards/8-ft-white-pvc-utility-trim-310630
.. they make you guess at the width and thickness - :-) :-) quite a useful web description - DUH ! but it does say 8 ft. long at least ... One of the customer comments said 1/4 x 6 inch x 8 ft. @ $ 40. John T.
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On 7/29/2020 7:51 AM, snipped-for-privacy@ccanoemail.ca wrote:

Many years ago I had a redwood picnic table on my deck that started to rot in places so I took it apart and made a planter out of it to grow tomatoes. I had lined it with polyethylene to keep water in. It lasted several years but eventually rotted out as I think eventually any wooden product would. OP wants to use what he has and should at least get a few years use. I ended up with large plastic pots that lasted a long time and were still in use until I got my new Trex deck when I decided to remove them.
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Cedar or treated wood planter boxes should last for years if sized to to hold a plastic planter - with breathing room between the plastic planter and the sides & bottom of the box. . and, of course proper drainage holes in the bottom. This method seems so much better ; long-lasting ; and easier on the gardener - less fuss. John T.
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