Better than RainX, but...
May 17, 2011
I've been using Glasswork Shield on multiple vehicles over for the past 4 years (after cleaning with the Spray Clay product, which I love). It goes on easy and it prevents or reduces wiper blade squeaking and skidding across the glass. But that effect will wear off after an hour or two of driving in the rain and it will need to be re-applied. I assume this is because it's water based.
Compared to RainX, I find that RainX actually increases wiper blade skid and rubber squeaking after a short period of time. I also find that a RainX treated windshield can be harder to clean because some cleaners and wiper fluids (especially with high alcohol content) act as a solvent and cause smearing of the RainX coating, which means two things 1) only clean Rainx with water and a cloth, and 2) I only treat side/rear windows with RainX. The GlassWorks products don't have these problems.