Which glue is best for tight joints without gaps or voids?

The most suitable choice for achieving tight joints without gaps or voids is yellow carpenter's glue. This type of adhesive is specifically formulated for woodworking applications, providing a strong bond that is particularly effective when joining wood pieces together. Its viscosity and adhesion properties allow it to fill minor imperfections in the surfaces being joined, ensuring that the connection is tight and seamless.

Yellow carpenter's glue, often a polyvinyl acetate (PVA), is easy to work with, dries clear, and can be sanded or painted over once cured. It is designed to create strong bonds while maintaining some flexibility, which can be advantageous in wood projects where slight movement may occur over time.

Other options, while useful in certain contexts, do not offer the same balance of gap-filling capability and overall performance for wood-to-wood joints. For instance, while epoxy provides an extremely strong bond and can fill larger gaps, it is more rigid when cured and can be more difficult to work with. Hide glue can be effective but typically does not adhere as strongly or fill gaps as well as yellow carpenter's glue. PVA glue, while also effective, may not be as robust in certain scenarios compared to the specific qualities offered by yellow carpenter's glue for woodworking.