Which glue is a one-part solution catalyzed by moisture and is known for sanding and staining well?

The one-part glue that is catalyzed by moisture and is noted for its ability to sand and stain well is polyurethane glue. This adhesive is particularly effective because it expands as it cures, creating a strong bond that adheres well to a variety of materials, including wood. The moisture in the air or the materials being bonded initiates the curing process, which allows the glue to set effectively without the need for additional mixing.

What distinguishes polyurethane glue is its versatility in the finishing process; once dried, it can be sanded down to achieve a smooth finish and is compatible with various stains and finishes. This is important in cabinet-making and fine carpentry where aesthetics are paramount.

While other adhesives listed may have their own benefits, they do not exhibit the same characteristics as polyurethane glue in terms of moisture catalysis and finishing capabilities. PVA glue, for example, is a popular wood glue but generally requires two components and may not perform as well with staining or sanding. Contact glue is designed for immediate bonding and does not allow for adjustments, which limits its application in fine cabinetry work. Yellow carpenter's glue, while effective for general carpentry, does not offer the same level of moisture activation and versatility in finishing as polyurethane glue does.