We are considering buying a glue pot edgebander. One task we would like to use it for is putting on thin solid wood edgebanding on panels prior to veneering. I assume this is common practice. Is there any reason to think that hot melt glue would be less rigid and more prone to telegraphing the banding through the face veneer than our current pva adhesive? Are there different types of hot melt for edgebanders that have better characteristics than others for this application?
From contributor ma
I would only consider a rigid glue line for this application.
From contributor Da
"I would only consider a rigid glue line for this application. "
Which application, veneer or banding, and why?
Telegraphing is caused by different hygroscopic materials or grain (e.g. MDF face to edge grain joints) expanding and contracting at different rates due to changes in relative humidity. The answer is design, e.g. similar size banding and edge profile, not glue.
Hotmelt VS PVA shouldn't make a difference (if the PVA glued materials have had a chance to fully dry/equalize with the environment).
I veneer (TBII) over 3-ply banding made from the same flitch. I prime the back of the banding w/ a very thin coat of PVA (undiluted) and get an excellent bond with any hotmelt. Without primer, a high quality hotmelt (standard EVA is fine) is recommended (e.g. HPK 25 VS 21).