We used 8518 over perf for years. Its not cloudy at all. Never had a single complaint from a customer about not being able to see. We have since switched to 8548. There is no difference in how clear 8548 is, but since we went to using nothing but 8548 on our wraps, we didn't want to keep 8518 in house just for perf. We used Oracal 290f or gf or whatever they call it for a year or so when we used oracal on everything, and had nothing but failures with it and all Oracal Wrap Materials.