Which of the following is necessary for maintaining a two-color acrylic enhancement?

Maintaining a two-color acrylic enhancement requires regular backfilling to ensure the longevity and aesthetic quality of the nails. Backfilling involves filling in the growth space between the acrylic and the natural nail as it grows out, which helps maintain the polished look and prevents any lifting or separation of the acrylic from the natural nail.

This process typically occurs every two to three weeks, depending on the rate of nail growth, and it allows for adjustments to be made to the color and shape of the enhancement while ensuring that the integrity of the nail structure remains intact. While polish, base coat, and top coat may offer additional layers of protection and visual appeal to the nails, they do not address the fundamental need to fill in the space created by nail growth, which is essential for preserving the artistic design of two-color enhancements.