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Hints, Tips and Solutions (Do NOT post requests for help here) If you have any useful general hints and tips for vintage technology repair and restoration, please share them here. PLEASE DO NOT POST REQUESTS FOR HELP HERE! |
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22nd Apr 2017, 9:51 am | #1 |
Retired Dormant Member
Join Date: Jul 2005
Location: Somerset, UK.
Posts: 334
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Cleaning records with PVA Glue - A tip
I only clean records with this type of glue when they are in a bad way and conventional cleaning has failed.
When doing a recent batch however, I found that when dried and I went to remove it, the glue fragmented and it took a great deal of effort and fiddling about to fully remove. As the glue had been seemingly thicker than usual when being applied, I decided to see if buying some new glue would make a difference. Well, it made all the difference in the world, as the dried glue easily came off in one piece and left a pristine looking disc behind. Moral: Always use freshly purchased glue! Alex |
23rd Apr 2017, 12:08 am | #2 |
Rest in Peace
Join Date: Jun 2006
Location: Chard, South Somerset, UK.
Posts: 7,457
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Re: Cleaning records with PVA Glue - A tip
Interesting: makes me wonder if when gluing wooden joints using old PVA produces joints with less strength than when using new adhesive.
Any suggestions, anyone? Al. |
23rd Apr 2017, 3:47 am | #3 |
Dekatron
Join Date: Apr 2009
Location: Oxfordshire, UK.
Posts: 4,935
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Re: Cleaning records with PVA Glue - A tip
In the days when I worked for Royal Ordnance, all of the paints and adhesives which we used had rigid use-by dates, even when un-opened. It was generally believed that many/most polymeric materials of that kind tend to undergo cross-linking of molecules as they age and so their properties change.
B
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23rd Apr 2017, 7:03 am | #4 |
Retired Dormant Member
Join Date: Dec 2007
Location: Shropshire, UK.
Posts: 3,051
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Re: Cleaning records with PVA Glue - A tip
It's usually recommended that PVA isn't exposed to frost, so storage conditions clearly affect it.
Cross-linking over time certainly seems likely, as even cooking oil will turn into varnish if left too long! |
23rd Apr 2017, 7:16 am | #5 |
Dekatron
Join Date: Nov 2010
Location: Oxford, UK.
Posts: 4,998
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Re: Cleaning records with PVA Glue - A tip
That is the whole principle behind furniture oil, like Danish and Teak oils. These have oxidation accelerators so that they harden in a day or so. But back before those, furniture makers used linseed and vegetable oils like walnut. Hardening times for a single coat was weeks (bit like cooking oils), and several coats were needed to finish a piece of furniture that way. And that was the driving force behind French Polish, each coat quick drying, and you can finish a piece really quickly (5 or 6 sessions of ten minutes each spread over a day or two)
Craig |