If you're working with 3D models in Maya, you may need to import OBJ files and bind skin to ensure smooth character animations and realistic movements. Here's a step-by-step guide to help you with the process:

1. Import your OBJ file: Start by opening Maya and navigating to 'File' > 'Import' to select your OBJ file. Make sure the file is correctly scaled and positioned within your scene.

2. Prepare your model: Before binding the skin, ensure that your 3D model is properly rigged and ready for animation. This may involve creating joints and setting up a skeleton for your character.

3. Select the geometry: Once your model is prepared, select the geometry that you want to bind the skin to. This is typically the character's mesh or surface.

4. Open the Skin menu: With the geometry selected, go to the 'Skin' menu and choose 'Bind Skin.' This will initiate the process of binding the selected geometry to the skeleton you have created.

5. Adjust bind settings: After binding the skin, you may need to adjust the bind settings to ensure proper deformation of the character's mesh during animation. This can involve fine-tuning the influence of each joint on the surrounding vertices.

6. Test the skinning: Once the skin is bound, test the character's movements to ensure that the skin deforms correctly and moves realistically with the underlying skeleton. Make any necessary adjustments to the skin weights and bindings as needed.

7. Save your progress: Once you are satisfied with the skinning of your character, save your work and continue with your 3D modeling and animation process in Maya.

By following these steps, you can successfully bind skin to your 3D models when importing OBJ files in Maya. This will allow you to create realistic character animations and movements that bring your 3D creations to life. Practice and experimentation are key to mastering the skin binding process, so don't be afraid to explore and refine your techniques for optimal results.