Yep, works wonders, Eric the car guy did pressure readings pre and post condenser cleaning and showed a noticeable decrease in pressure, although his condenser may have been wet when he did the post readings.
https://www.youtube.com/watch?v=r_em9lm69HQ
There are so many coatings available and there is no one size fits all answer, except for question 2. Do not use a paint coating on glass. There are dedicated coatings for glass. The best bang for your buck coating is CQuartz UK 3.0. This can be layered, but there is specific timing for layering...
I had numerous issues, likely user error, and I found the guide below to be the most helpful for 64 bit systems: http://blog.obdexpress.co.uk/2017/01/24/install-mini-vci-with-techstream-v10-on-64bit-computer/