FerreX is a decontaminant product specifically for metal deposits, and should be used as a pre-wash, not a "wash & rinse" product. Power Clean can also be used directly (not only with foam cannons) - 100% Power Clean is good for heavy duty cleaning (engines, wheels, etc), mixed 1;3 its good to decontaminate paint, remove tar/bugs, etc, and at 1;5 it cleans interior vinyl/leather/fabric. Always wipe/rinse Power Clean off after application.
Duffer, I don't have any solutions for wiper chatter, not supposed to happen. One thought is there might be high spots on the glass, causing wipers to bounce. They should wear down with time. Opti-Glass Pro cures VERY quickly and is susceptible to high spots - you should check with your installer.
Alex, you can trust Dann to stay on top of your situation. You are correct in that OCP bonds to your clear coat, but light polishing can remove it without reducing the clear. Recoating can be done with no issue. Occasionally marring/swirls can be missed during prep for Coating, ones that appear only in certain light, but the installer should be able to correct and reapply OCP. Several years ago we had a customer in Dallas that had swirls that only showed up at sunset on cloudy days - true situation, but how does an installer prepare for that? Optimum took care of him.
Welcome to all things Optimum! Your Coating should be good - requirement is keep dry for 12 hours, don't wash with soap for 7 days. I've heard some have an issue with "wiper chatter" after applying Opti-Glass, but never had that problem myself. Hopefully after additional curing the chatter will disappear.
Agree with A&J that Optimum Carpet & Fabric is a better choice for mesh, will clean and leave protection. The difference between Wax and Seal as drying aids is the look and durability - Seal will last twice as long.
Welcome to the Optimum Forum! Your methodology sounds excellent. One suggestion is to mix ONR in the pre-spray/instant detailer ratio = 1 oz to 16 oz of water. How frequently you wash is really dependent on driving conditions. I don't believe there would be any problems using Meguiars with Opti-Seal, but we don't test with competitive products. Opti-Seal and Spray Wax are safe on all surfaces and don't forget headlights/glass. Layering Opti-Seal would extend durability but 12 months would be unusual. Durability again is a function of driving conditions, maintenance, etc. You can apply Opti-Seal with a variety of applicators. Using a touchless car wash (with strong solvents) will reduce the longevity of Seal or Wax but how much is difficult to predict. I'm not sure about how the products will affect nanaskin, again, not an Optimum product.
I'm sorry that you're not satisfied with your experience with Opti-Coat Pro+. I can understand your frustration but take exception to comments about OPT "hiding" behind it's statements and threats to "tell your story" on social media. Optimum stands by its products and is not afraid of criticism. The OCP+ Warranty specifically names hard water spots as an exception, because it's beyond our control if hard water is used or is allowed to dry/bake on. If your car looked amazing when picked up, the water spots occurred afterwards and are your responsibility - there is no way the installer is at fault AND there is no Coating that can protect from water spots that are not properly handled by the owner. There are other solutions for water spots and your installer should contact Yvan/OPT to see if the situation can be reconciled.
A Paint Prep or IPA wipe down is extra insurance that you've removed all residue. If you use Hyper Polish, a micro fiber dampened in even diluted Paint Prep should be sufficient for a strong coating bond.