1. False
There are hundreds of different adhesives formulated for thousands of different applications. Choosing the correct glue for your project could determine its eventual success or failure.
2. True
Although many glues have multiple applications there isn't one that can "do it all."
3. False
White and Yellow glues (Poly-Vinyl Acetates) are formulated with different viscosities, solids contents and chemical modifications, for different applications.
4. False
Color has nothing to do with a glue's strength or quality.
5. False
There are few, if any, applications in which synthetic glues, such as PVA, can't outperform, hide glues.
6. False
"Aliphatic" simply describes a broad family of organic chemicals that includes PVAs.
7. True
Formaldehyde glues, although they have different chemical components, are water based just like PVAs.
8. False
Most commonly used wood glues are water based and will not harm wood if high solids glues are used, assembly times allowed, and spreads are controlled.
9. False
Many applications require a glue that is not thick. Although there are adhesives available that have gap filling qualities, just because a glue is thick doesn't mean it is capable of filling gaps and voids.
10. False
Actually, too much glue can result in a thick glue line and, hence, a weaker bond.
11. False
Too much pressure could result in a starved glue joint and a weaker bond.
12. False
Catalyst levels depend on the glue and specific catalyst formulations. Some catalysts speed cure as they are increased; others slow down the cure rate.
13. True
Although some glues appear to take stains better than others, there is no glue that is stainable.
14. False
Using mechanical fastening devices when edge gluing tends to weaken the glue joint by disrupting a smooth true edge joint that will provide maximum strength. Devices such as biscuits or dowels should only be used to maintain alignment or to add strength in miters and butt joints.
15. False
Gluing end grain may require sizing before gluing and the use of a high solids glue.
16. True
Ideal moisture content for gluing is 6.8%, therefore, higher air dry moisture should be avoided. Higher moisture levels also result in wood movement after gluing with accompanying checks and splits. Lower moisture content may interfere with the glue's ability to properly wet the surface.
17. False
Often, it is better to allow the glue to set for a little while before applying pressure.
18. False
Although there are glues available that will set quickly, strength is often sacrificed.
19. False
Regardless of the glue used, it is a good idea to allow it to cure for 24 hours before machining.
20. True
When using conventional PVA the cure rate is not affected by heating the glue line, in fact, bond development may be slowed.
21. False
Only glues that are "Waterproof" such as Resorcinol Resin will provide absolute protection from moisture.
22. False
Most glues are made with some chemicals that may be considered toxic. With normal precautions, most glues are completely safe to work with.
23. False
Although many glues are "freeze/thaw stable" many do not perform well at low temperatures.
24. False
Many shops become excessively dry during the winter causing numerous gluing problems because of resulting moisture loss from the stock.
25. False
Often, gluing bowed or twisted stock results in undue stress on the glue joint and glue lines that are either too thick or starved of adhesive.
26. False
Because of the myriad factors involved in gluing and testing, the only way to accurately measure glue performance is through a laboratory testing facility.
27. False
Once reconstituted, powdered glues actually have a higher solids content than many PVAs, and therefore are less likely to bleed through veneers.
28. False
All glues have a definite shelf life after which their performance deteriorates significantly.
Originally Posted by waterboy0911
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