Glue penetration

Incorrect glue viscosity when varnishing or defective veneering (cracks) causes the glue to penetrate the veneer (penetration) leading to faults in the colour or structure of the surface coat that are visible after staining and coating with lacquer. Attention is to be paid to a clean surface, the viscosity of the glue, the amount applied and compliance with the pressing conditions in order to provide glue from penetrating. Glue penetration can also be reduced with coarse pore timbers by means of appropriate extenders. Gluten glue can be washed out with wood soap, white glue with warm water, provided it has not hardened. Reactive resin glues cannot be removed