tag:blogger.com,1999:blog-4695685403802703716.post426476755395380512..comments2024-03-10T00:46:33.915-08:00Comments on WPatrickEdwards: Why Use Reversible Glue?W. Patrick Edwardshttp://www.blogger.com/profile/15001954861903457707noreply@blogger.comBlogger9125tag:blogger.com,1999:blog-4695685403802703716.post-37444322113556391302021-02-08T19:17:47.962-08:002021-02-08T19:17:47.962-08:00Any suggestions for a Glue such as Gorilla Glue In...Any suggestions for a Glue such as Gorilla Glue In A Woman's Hair?? Anonymoushttps://www.blogger.com/profile/15011850168975443140noreply@blogger.comtag:blogger.com,1999:blog-4695685403802703716.post-1775764842436704612012-01-13T08:20:13.456-08:002012-01-13T08:20:13.456-08:00Thank you very much. You're a wealth of real ...Thank you very much. You're a wealth of real information.<br />PaulAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-4695685403802703716.post-20781591684910567642012-01-13T07:48:43.138-08:002012-01-13T07:48:43.138-08:00We did a lot of study on this issue in France, wit...We did a lot of study on this issue in France, with serious lab analysis and accelerated aging techniques. We were working to understand the best ways to glue metal to wood, since we were concerned with restoration of Boulle surfaces.<br /><br />The primary physical problem is that wood and metal move in opposite directions during environmental changes. Heat causes metal to expand and lack of humidity causes wood to shrink. Cold causes metal to shrink and excess humidity causes wood to expand.<br /><br />Therefore, the decorative surface is at risk of lifting during these changes. <br /><br />For that reason the early European cabinetmakers generally used fish glues to attach exotic materials to wood surfaces. Fish glue has much lower sheer strength than animal protein glue. It "relaxes" its grip during changes in heat and humidity and allows the surface to slip slightly, while still holding it down. We also did research which confirmed that using a fresh clove of garlic on the metal surface prior to gluing provided a better bond, as the garlic worked to mitigate the surface oxidation of the metal. Finally, the glue side of the metal must be toothed, using a toothing blade or hack saw blade, scraping grooves in the surface to increase surface area for the glue.<br /><br />The biggest problem with Boulle restoration occurs when repairs are made using nails or epoxy. By fixing areas of the surface with these repairs, there is no allowance for surface movement, and the rest of the surface will quickly detach during heat/cold and wet/dry cycles.<br /><br />Not to mention the problems with removing nails and epoxy during restoration. By contrast, fish glue can be easily removed with cold water.<br /><br />To answer your question, use fish glue not Old Brown Glue for metal to wood bond.W. Patrick Edwardshttps://www.blogger.com/profile/15001954861903457707noreply@blogger.comtag:blogger.com,1999:blog-4695685403802703716.post-86778177779136134892012-01-13T07:26:53.645-08:002012-01-13T07:26:53.645-08:00I think you should be able to, if you etch the cop...I think you should be able to, if you etch the copper surface with garlic first.<br />http://www.fullchisel.com/blog/?p=91Joenoreply@blogger.comtag:blogger.com,1999:blog-4695685403802703716.post-7336105276682818182012-01-12T20:01:25.376-08:002012-01-12T20:01:25.376-08:00Patrick,
In addition to the bent lamination, I'...Patrick,<br />In addition to the bent lamination, I'm thinking my next piece will have sheets of copper applied to two wood surfaces...somewhat large surfaces, say 18" X 48". Is Old Brown Glue right for this and if not what you suggest?<br />Thanks, PaulAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-4695685403802703716.post-39325245602560914192012-01-09T14:28:06.111-08:002012-01-09T14:28:06.111-08:00Je vous en prie. C'etait un plaisir de vous a...Je vous en prie. C'etait un plaisir de vous aider.W. Patrick Edwardshttps://www.blogger.com/profile/15001954861903457707noreply@blogger.comtag:blogger.com,1999:blog-4695685403802703716.post-47823728046547829042012-01-09T12:28:12.309-08:002012-01-09T12:28:12.309-08:00Excellent info. Thanks for the time spent to help ...Excellent info. Thanks for the time spent to help me understand what it is that is going on. Once a principle is understood (in this case how hide glue works) I can apply it creatively as the piece dictates (as you have noted) Thanks for shining the light on "forgotten by most" techniques.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4695685403802703716.post-23045052263538786642012-01-09T11:47:13.856-08:002012-01-09T11:47:13.856-08:00I have several 19th century period references whic...I have several 19th century period references which mention techniques for removing veneer. One says to coat the surface with linseed oil and place near a fire. This method uses the oil to transfer the heat through the veneer to soften the glue, which I suppose still has a moisture content sufficient to liquify the glue. Another method mentioned is to place the board with the veneer side face down on a bed of wet sawdust and leave overnight. This method works fine, but it will warp the board, and the veneer needs to be pressed between newspaper to dry out flat.<br /><br />Conclusion: prolonged exposure to cold water alone will reverse the glue, but I only use this method to salvage materials, not for delicate conservation of fine antiques.<br /><br />I prefer steam, where conservation of the finish is not an issue. Usually the finish is shellac so it can easily be repaired if damaged, however.<br /><br />I also have successfully used a special hammer which I have just for this purpose. It is made with a paper head. The paper is saturated with glue and makes a firm surface which doesn't damage the wood. By tapping repeatedly on the joint I have been able to break old joints open without damage. You need to be patient and understand how much force and from what direction will work.<br /><br />Aside from that, you need to be creative to get the water and heat to the glue, where joints are not easily accessible.<br /><br />In some cases, I have also used alcohol, but I find water and heat methods have proven easier and quicker.W. Patrick Edwardshttps://www.blogger.com/profile/15001954861903457707noreply@blogger.comtag:blogger.com,1999:blog-4695685403802703716.post-91920351479125457542012-01-09T09:45:41.471-08:002012-01-09T09:45:41.471-08:00Excellent write-up. In my previous comment (which ...Excellent write-up. In my previous comment (which I hope inspired this post) I mentioned I'd tried alcohol to crystalize the glue (based on google search results) Any more comments on that technique or should that be avoided and only use heat and water? I am usually a little averse to water based on grain raising, but maybe because the showing parts will already have finish on them it won't matter?<br />What sort of time and volume of water are we talking about? (rag/sponge/cup/bucket) (seconds/minutes/hours)Anonymousnoreply@blogger.com