Hearted Youtube comments on Project Farm (@ProjectFarm) channel.
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Spot on! I'm a mobile technician in the South and I drive a lot, so I've real-world tested just about every hydrophobic product out there. My personal regimen is Aquapel every 6 months, and keep a bottle of RainX in the back seat.
The only issue I have with Aquapel is that if you use your windshield wipers (bugs, excessively heavy rain that overwhelms the product), it actually scratches the Aquapel layer, installing fine linear scratches in the path of the wiper blades over time, which can lead to borderline crippling hazing and glare in some rain conditions. Because Aquapel is a silica-based product that chemically crosslinks to the glass, it has to be mechanically removed before recoating. Meguiar's Ultimate Polish and a DA polisher works well for me.
In contrast, RainX is a silicone solution emulsified into a wax with an alcohol-based emulsifier. It simply sits on the surface of the glass, and is highly susceptible to heat and mechanical removal (windshield wipers). But it's also dirt cheap and available almost anywhere in North America, and very easy to apply.
Sorry for the text wall! I wanted to add some real-world insight that doesn't translate well into laboratory testing. :)
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