The reasons for the slow drying rate of water-based acrylic lotion may include the following:

1. High environmental humidity: The high moisture content in the air is not conducive to solvent evaporation.  

2. Low temperature: Low temperature will reduce the speed of molecular motion and affect the drying process.

3. Thick coating: Thicker coatings require more time to dry.  

4. Poor ventilation: unable to timely discharge volatile solvents.

5. Improper use of additives: Inappropriate additives may affect drying.

6. Coating method: Different coating methods can affect solvent evaporation.

7: Curing conditions: such as inappropriate curing time, curing temperature, etc.

Do you know any other reasons? Please leave a message in the comment section and let me know