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Thread: How long should PU glue last
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15th February 2021, 09:08 AM #1.
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How long should PU glue last
Did a bit of a clean up last year and found and almost unused bottle of Gorilla glue that was a couple of years old.
It was well sealed, had no crust, and flowed reasonable easily so I set it aside and yesterday I decided to use it on a small job and find its simply not drying .
So my question is how long should PU glue last?
I looked on the Gorilla glue website and can't find any info on lifetime but it does say this.
STORAGE TIPS –Store in a cool, dry location. Avoid laundry rooms, under sinks, and kitchen cabinets.
OK so my shed does get pretty hot at times during summer. I do store stuff like silicone adhesives and sealants and superglue in SWMBO's grog fridge - should I be doing the same for the PU glue?
I only just chucked out an almost used up crusty bottle of Titebond PU glue that was a lot older than the gorilla bottle - both had been stored in the shed.
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15th February 2021, 10:34 AM #2GOLD MEMBER
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Hi Bob,
Their tech sheet says minimum shelf life 1 year - presumably that is if stored according to recommendation:
http://www.targetsupply.com/pdf/data...e_techdata.PDF
Regards,
Brian
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15th February 2021, 10:38 AM #3.
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15th February 2021, 10:50 AM #4GOLD MEMBER
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I think if you look after it, it will last forever. Everybody knows that PU cures by moisture, what I found was that, just before PU cures, evaporation of solvent takes place. So as long as your glue has a reasonable amount of solvent in it, you can rejuvenate your glue with added solvent. I have a Gorilla PU glue that I bought from Masters all those years ago, sitting in the garage while I was in NZ. When I came back, it has sort of gone quite thick. Not wanting to throw it away. I thinned the glue with a solvent, gave it a good shake and it was just as good as new. After I finish, I place a kid's balloon over the tip to try to keep the evaporation down. I'm still using it.
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15th February 2021, 11:14 AM #5GOLD MEMBER
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Polyurethane glue catalyses with the moisture in the air, if you could store it in a vacuum it would keep forever, but once it’s exposed to air, and therefore moisture, the process starts. I have lost track of how many half full bottles of that foaming poly wood glue I’ve thrown out, It’s bloody annoying, and it’s good glue too. There’s a sika one with a Superman on the label which comes in a cartridge for a caulking gun which I’ve found lasts the longest, most likely because there’s no air in the container it’s in.
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15th February 2021, 01:40 PM #6.
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Thanks everyone for the responses .
The gorilla PU has an odour of strong acetic acid so wondering is that is the solvent but I am reluctant to add vinegar because most of what is commonly called vinegar is 96% water.
Pure acetic acid is a surprisingly good solvent and is available but it costs more than a replacement bottle of the glue.
The instructions say is if thickens (which it has), to thoroughly remix the contents of the bottle. I have done that but it doesn't seem to have unthickened that much.
Meanwhile I have parked the glued up pieces in the sun and the glue does seems to be hardening albeit slowly The pieces are nothing special and I have plenty of replacements so if it fails I can easily remake them.
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15th February 2021, 09:29 PM #7GOLD MEMBER
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There’s a very good little chart in an article by UK woodworking guru Marc Fish (Furniture & Cabinetry, issue 167)
https://marcfish.co.uk/wp-content/up...ort-cutsah.pdf
Regards,
Brian
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16th February 2021, 08:22 PM #8.
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Well its definitely hardening now. Today was really humid so that might have something to do with it.
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16th February 2021, 09:22 PM #9GOLD MEMBER
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