Craft · 6 pages · 12 min
How glue starves if the fit is wrong
A bad fit leaves high spots squeezed dry and gaps filled with a thick, weak glue line.
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From the opening
Wood glue bonds by wetting both faces and curing as a thin film between them, and many common glues are strong only when that film stays thin. If the parts touch on high spots and stand apart elsewhere, clamp pressure empties the high spots of glue while the gaps keep a thick, weaker layer. The opening covers high spots squeeze the film out, gaps keep a thick weak line, and many wood glues will not fill.
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Inside
- High spots squeeze the film out
- Gaps keep a thick weak line
- Many wood glues will not fill
- A dry break shows bare wood
- Where the idea stops applying
- A distinction worth keeping
Sources
- Starved glue joints under clamp pressure
- Thin-film strength of hide glue and PVA