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ANTIQUE FURNITURE RESTORATION DISCUSSION BOARD
Posted By: Tim Judson (cm-66-169-72-212.ashe.nc.charter.com)
In Response To: Re: Longcase clock glue (Geoff)
Date: 4/27/3 19:38
I would advise reglueing with fresh hide glue if the glue blocks fail; use a higher gram strength glue (251 g. or higher) to counteract the tendency for the glue to soften under high humidity. Avoid "liquid hide glues" which have shown to be more prone to softening under higher relative humidity (see research from Winterthur museum). I think this latter is more of your problem than high temperatures.
Glue blocks traditionally require "rub jointing" which achieves optimal strength through the use of hot hide glue (Scotch glue in UK). Yellow glues (aliphatic PVA's will have moderate capabilities in this regard if you check the tack point accurately but will not provide equivalent shear strength). Rub joints require no clamping which explains their use in confined quarters in period furniture. They are also very quick and easy to undertake. If you're in doubt, locate a reputable restorer to do this for you.
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