If you printed with any flavor of solvent ink, ecco, light, whatever, there's no spray product that is suitable. Virtually all spray products are solvent based and you need a water based product to coat a solvent print.
You can get away with a solvent based spray product but that's exactly what you'll be doing, getting away with it.
Every banner printed in this shop gets a coat of Clear Shield, original formula, thinned to the consistency of milk and applied as thin as possible with a foam brush. Before hemming. Not only does this provide a satisfactory level of abrasion and uv protection, it makes the colors more vibrant. It takes less than 5 minutes from can open through clean up, worth it.