What are the disadvantages of polyurethane wood glue?

1. Limited open time: Polyurethane wood glue has a relatively short open time, meaning that it sets quickly once applied. This can make it difficult to adjust and reposition the glued pieces before the glue sets.

2. Messy application: Polyurethane wood glue can be messy to apply, as it tends to foam and expand as it cures. This can result in excess glue squeezing out of the joint, which can be difficult to clean up and may require sanding or scraping.

3. Strong odor: Polyurethane wood glue has a strong odor that can be unpleasant and irritating to some individuals. Proper ventilation is necessary when using this type of glue to avoid inhaling harmful fumes.

4. Difficult to clean up: Once polyurethane wood glue has cured, it can be difficult to remove from surfaces. It may require sanding or scraping to remove excess glue, which can be time-consuming and labor-intensive.

5. Not ideal for all wood types: Polyurethane wood glue may not be suitable for all types of wood, as it can cause staining or discoloration on certain species. It is important to test the glue on a small, inconspicuous area before applying it to the entire project.