To prevent sanding through the stain when clear coating cabinet doors, there are several key steps to follow:

1. **Preparation is Key**: Ensure that the stain on the cabinet doors is completely dry before applying the clear coat. This typically takes about 24-48 hours, depending on the humidity levels in your workspace and type of wood stain.

2. **Thin Coats**: Apply thin, even coats of clear coat to the cabinet doors. Thin coats dry faster and are less likely to be sanded through accidentally. Apply 2-3 coats without sanding before moving to the next step.

3. **Sanding Between Coats**: Use a fine-grit sandpaper (such as 320-grit) between each coat of clear coat. This will help the subsequent coats adhere better without sanding through the stain.

4. **Multiple Coats**: Instead of trying to achieve full coverage with just one or two coats, apply multiple thin coats of clear coat. This will build up a more durable finish and reduce the risk of sanding through the stain.

5. **Patience**: Allow each coat of clear coat to fully dry before sanding or applying the next coat. Rushing the process can lead to mistakes that result in sanding through the stain.

6. **Light Touch**: When sanding between coats or after the final coat, use a light touch. Let the sandpaper do the work and avoid applying too much pressure to prevent accidental sanding through the stain.

7. **Test in an Inconspicuous Area**: Before applying clear coat to the entire cabinet door, test the process in a small, inconspicuous area to ensure that you have the technique down and are not at risk of sanding through the stain.