The Secrets Removable Builder Clear Gel is a crystal clear gel perfect for building and sculpting nails. The Secrets Removable Builder Clear Gel is also great for encapsulating nail art designs. - NSI presents the latest in nail gel technology, the Secrets Removable Gel System. Secrets Removable Gels capture the same ease and workability as acrylics without the set time. You can take your time applying the product onto the nail as it only hardens when cured.