Applying builder gel to achieve a perfect nail shape involves a step-by-step process, emphasizing precision and attention to detail. Here's a guide to help you achieve optimal results:

1. **Prepare the Natural Nails:**
- Start with clean and well-prepped natural nails. Ensure that the nails are free from oils, lotions, or any residues.
- Gently push back cuticles and remove excess cuticle growth to create a clean canvas for the builder gel application.

2. **Select the Right Builder Gel:**
- Choose a high-quality builder gel that suits your preferences and client needs. Builder gels come in various viscosities, so select one that allows for easy application and sculpting.

3. **Apply a Base Coat:**
- Begin by applying a thin layer of clear or translucent base coat to enhance adhesion. Cure this layer under a UV or LED lamp according to the product's instructions.

4. **Build the Apex:**
- Start applying the builder gel from the center of the nail, working towards the free edge. Use a brush or spatula to shape and build the apex (the highest point of the nail) for added strength and structure.
- Be mindful of the gel application near the cuticle area, ensuring a seamless blend without touching the surrounding skin.

5. **Sculpt the Desired Shape:**
- Sculpt the gel to achieve the desired nail shape. Whether it's a square, oval, almond, or stiletto shape, use your tools to shape the gel accordingly.
- Take your time to refine the sidewalls and free edge, ensuring symmetry and a smooth transition between the natural nail and the extended gel.

6. **Check for Symmetry:**
- Regularly check for symmetry and balance as you build and shape. Adjust the gel as needed to maintain a consistent and harmonious nail appearance.

7. **Cure the Builder Gel:**
- Once the desired shape is achieved, cure the builder gel under the UV or LED lamp. Follow the recommended curing time specified by the product to ensure proper hardening.

8. **File and Refine:**
- After curing, file and refine the nails to perfect the shape further. Use a fine-grit file to smooth any rough edges and create a polished look.

By following these steps and practicing precision in your application technique, you can achieve a perfect nail shape with builder gel, resulting in durable and beautifully sculpted nails.