What is the difference between a D3 and D4 PVA wood glue?
Water resistance. Both D3 and D4 PVA's will give a water resistant bond, but D4 is the higher standard, meaning that it can be used for external joinery. D3 adhesives have been well established for internal, general purpose assembly and can also be used for laminating and veneering as well. They are simple to use, clean up easily whilst wet and are fast setting. Most products you can buy will be D3 standard adhesives. General purpose PVA, such as those supplied for dilut