How Much Wood Glue Should You Use?
Wood glue is used in several jobs and projects. However you should keep in mind some basic points which can guide you to how much wood glue to use in practice for better results and to reduce wastage.
Coating on Flat Areas
It is a general rule to completely coat the area which you intend to stick with glue. This will help in achieving a better adhesion and to prevent parts from remaining unstuck and possibly start getting unattached. However this does not mean that one needs to apply a thick coating of wood glue. It is enough to roll out a thin, level and uninterrupted coating.
Wood glue can also be used to attach one edge to another. This requires more care because edges tend to be a bit more demanding to stick to one another. So, make sure you use good quality wood glue which can ensure a good attachment. In such a case you may need to use more glue and when you press one edge to another, some glue may squeeze out from the sides due to being in excess. In such a case just wipe it away with a cloth immediately. Leave it to dry and check whether the two edges are stuck well to each other. If the edges are somewhat blunt, rounded or rather small, and as a consequence you could not use enough glue to enable the sticking to be done effectively, then you may need to reinforce the sticking of the taller sides and the flatter areas with more glue and use screws, nails or clamps for extra security.
Fixing Tenon and Mortise Joints
In several wood projects the tenon and mortise joints are used to fix one end to another securely and effectively. These practically fit into each other, and are then reinforced with some wood glue on the inner sides. In this case it is not necessary to use plenty of wood glue because the way the tenon and mortise fix onto each other is already a secure fit if they are carved or cut out carefully and precisely. However, do make sure to use a thin coating on the flat, inner areas.
Consider the Area in Question
A crucial aspect to consider before starting squeezing out the glue onto the wood is the area which needs to be fixed. The most important thing is to consider applying more wood glue, the larger the wood piece in question, is. If for example, you are going to stick a circular shaped wooden part, do not apply wood glue only on the circumference or maybe a dab or two in the center. If you use a roller you will be able to spread the wood glue even inside the circle, and this will help in the overall end result.
When using wood glue onto wood try to keep in mind the analogy of using butter onto bread. Just as when you spread butter onto a piece of bread, you do not want to use too much butter. But on the other hand you do not wish to have areas on the bread which are not coated with at least a thin layer of butter. This applies in the case of using wood glue on wood.