Hard Lock light on really easy to install. Comparing the Zen-Xero Dynamic, it wears off much quicker. In other words, Zen-Xero Dynamic lasts on the car 3-5 years and Hard Lock Light only for 6-8 month. In that case you just need to reapply quite often but the water repellency almost the same. Take a look at the case study where you can see clear difference untreated and treated with nano glass coating (Zen-Xero Dynamic)