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Thread: Un-gluing
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2nd March 2012, 09:40 AM #1
Un-gluing
Not sure if the title is a real word but that's what I want to do.
I have a couple of small paneled doors on a bathroom cupboard that need rebuilding/replacing because, during assembly, I have managed to attach the panels to the posts and stiles. I think maybe the finish is the culprit rather than glue but in any event the expansion/contraction of the panels has opened up the joins in the posts and stiles.
So, as I said they either need rebuilding or replacing. I am hoping to disassemble them but to do that I need to weaken the glue (Titebond II) as much as possible.
I have read that white vinegar works on the PVA family so I might try that BUT I have also heard that PVA breaks down if it is subjected to sub-zero temperatures.
Now these doors will fit in my freezer ..so I was just wondering
Any comments?
Thanks
Ian
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2nd March 2012, 10:08 AM #2Senior Member
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I have successfully unglued Selleys PVA in small components with some gentle direct heat either with an iron or microwave, can't comment on Titebond, be careful with the finish, if you want to retain the finish try a damp /wet rag over the joint and attempt a steaming environment.
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6th March 2012, 08:14 PM #3
Ian
when building the doors, did you allow a "fitting" margin on the styles -- ie a bit of extra width to be planed off later? If so could you cut the rails off with a narrow kerf saw (think Japanese saw) and redo the joints with floating tenons?
if the panels are only held by the finish you should be able to tap them out once the rails are cut freeregards from Alberta, Canada
ian
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6th March 2012, 10:29 PM #4
Ian ,
Yep, I thought I did everything right but I think the finish (Cabots CFP) gummed everything up.
I used biscuits when I put the frames together so I'm hoping they won't be too difficult to dis-assemble but I'm sure they'll put up a struggle.
I have a Jap saw that'll probbaly do the trick but I am hoping for a no destructive solution if at all possible
Getting back to the possibility of freezing the PVA - have you ever tried/heard of it ?
Thanks for your response
Regards
Ian
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6th March 2012, 11:30 PM #5
Hi Ian
I have never tried freezing, though I have used heat to take joints apart
However, thisOriginally Posted by Ian Smith
Biscuits are compressed during manufacture and swell when they come in contact with the water in the glue.
I don't expect anything will budge them as a lot of their strength comes from the wedging action of the swelling rather than the glue -- even when the glue is still runny, biscuits can be a real pain to extract from their slots. DAMHIKT
On one of my Tech projects I stuffed up the location of the biscuit slots. To recover I cut some biscuits so that two pieces effectively filled the entire slot, glued them in, let the glue dry and after trimming the piece of biscuit sticking out had a repair that was as solid as the original timber. The recut slots went partly through the repair and gave me a solid joint.
In your position I think I'd try to get the panel to expand a little more -- to push the joints that bit further open -- and then cut the rails off with the Jap saw.
When reassembling, I'd use loose tenons or (shock--horror) a pair of dowels in each jointregards from Alberta, Canada
ian
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