I just got a heck of a deal on several large, thick, glazedm frost resistant pots. The problem is that most have hairline cracks. I would like to keep them as long as possible so I can use them for dwarf raspberries. Does anyone know of a treatment to help hold pots together? A neighbor recommended clear flexi-seal spray. Thoughts?

So I have poked around on youtube and most methods of saving large pots seem to involve drilling holes on each side of the crack and lacing it up with wire like a shoe. One video used galvanuzed wire tightened around it like a barrel stave. The latter seems more reasonable to me given it does not further weaken the pot. Any other ideas?

That sounds like it would work. I've had large cracked pots I've saved by spraying inside and outside with Terracotta sealer, and putting an additional layer of silicone sealer inside on the crack. They lasted for years with this treatment.

Silicone...like caulk or a spray? Where does one find terra cotta sealer? A friend texted me about waterglass (sodium silicate). Seems too easy?

I've gotten the pot sealer in the big box stores...Lowes and HD. The silicone I used was in clear, flexible caulk form made by Loctite.
I have no idea what waterglass is!

If indeed the problem is "hairline" crack, I think a product (flexi-seal)that was mentioned may be a good first step to remedy it.
http://www.homedepot.com/p/Rus...

But if the problem is more like a crack that may separate the portions of the pot, I would say that the technique of wiring both sides of the crack would be good.
I had a 25" diameter frost resistant pot damaged in a house move and I was afraid that the bottom was going to separate from the side. We first brushed on thickly a sealing solvent inside the pot to fill the crack and beyond, and then proceeded to drill the holes on each side of the crack. We then "laced" the sides with plastic covered copper wire, hopefully to prolong the life of this huge pot. It's been 2 years and still holding steady.

There seems to be some question about flexi-seal longevity and toxicity given online discussions. Additionally, finding the once-common waterglass (sodium citrate) is difficult locally. I finally ordered it this morning from Amazon.