What is Unistrut Finish? A Unistrut finish is a protective layer applied to the channel steel. Its main purpose is to fight corrosion and extend the lifespan of the product. Some finishes are designed for simple indoor use, How to Choose the Right Unistrut for Your Project Understand your project needs Material Selection Consider corrosion resistance Choose the right finish... https://www.robexstrut.com/blog/unistrut-finishes/