Points to heed:

• Regularly change the abrasive paper
• Ensure the surface has a uniform finish
• Remove all residues and dust from the surface after sanding
• When sanding using machines, the wood can become too hot and can burn
• Risk of residues of the abrasive material in the substrate
• Abrasive materials can sometimes introduce iron ions into the wood. When bonding with dispersion adhesives this can lead to a blue coloration (when bonding oak, chestnut and walnut (tannic acid containing woods)).
• For extract-rich woods, sanding causes the extracts (oils, resins, minerals) to accumulate on the wood surface. It is possible that this can adversely affect the bonding properties.
• The time between sanding and bonding should be short. Long interim storage can result in extracts migrating to the surface, negatively affecting the subsequent bonding process.