What are the key advantages of using polygel for nail enhancements compared to other methods, such as acrylic or traditional gel nails? How does the application process of polygel differ from other nail enhancement techniques, and are there any specific tools or steps involved? Can polygel be used to create various nail shapes and lengths, including extensions or overlays, while maintaining a natural and lightweight feel? How does the durability and longevity of polygel nails compare to other nail enhancements, and what steps can be taken to ensure their longevity? Are there any specific maintenance or aftercare tips for polygel nails, such as recommended filing or sealing techniques, to keep them looking their best? What are some popular trends or creative possibilities with polygel, such as nail art or color effects, that can be explored?