Hot Spring Spa Cover Shield Spa Cover Treatment for Vinyl Surfaces Cover Shield cleans, shines and protects vinyl cover surfaces. 16Oz Bottle of Hot Spring Spa Cover Shield Spa Cover Treatment for Vinyl Surfaces. Whether you're a new spa owner - or simply just taking on your own spa maintenance, our Hot Spring Spa Cover Shield Spa Cover Treatment for Vinyl Surfaces is an essential hot tub treatment to have as part of your spa care routine. No matter the model of your spa or hot tub, or when it was made - it's important that you regularly sanitize and treat your spa to prevent bacteria build-up. Choose from our selection of hot tub filters and maintenance products to find the right hot tub sanitizing system for your spa - at the right price! Hot Spring Spa Supplies carries spa fragrances, air & water valves, control systems, filter accessories, lights, cleaners, pumps, thermostats, and more for virtually every hot spring model.