"Agki Strodon" wrote in message
nk.net...


How about glues that hold metal pieces together. They don't penetrate the
metal. The problem is the strength of the glue bond to each piece and the
internal strength of the glue layer itself. A roughed up surface holds
better than a smooth one because there's more glue in the between pieces
volume, ain't it?

A roughed up surface does not necessarily mean a better bond. Have you ever
laid a pane of glass on top of another with water between the two? Almost
impossoble to pull apart because of the surface tension.