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SlowMPS sums it up pretty well
The durability of any wax or sealant placed on top of the Opti-Coat will be drastically
reduced when compared to placing it on top of a regular bare paint surface. As mentioned above, the properties of Opti-Coat are such that it is designed to be hydrophobic and shirk off anything trying to stick to it. Including waxes and sealants.
Personally I wouldn't bother with a wax or sealant on an Opti-Coated surface. As Chris says above, a wax or sealant can effectively
hamper Opti-Coat doing its job. Something I've also seen first hand.
What I recommend to people is a light spritz of Optimum Instant Detailer and Gloss Enhancer while drying the car after washing. This acts both as a lubricant while you're drying the car, and also helps add some nice slickness to the Opti-Coat. It's a great product. Highly recommend.
http://www.zas.com.au/product/427/op...cer_504ml.html
With regard to Amigo, it is an excellent product to use as a paint cleaner on Opti-Coat.....HOWEVER..... I would not be using it for at least SIX months after Opti-Coat is applied. And even then only use it by hand (not by machine polishing).
Amigo does contain some very very light abrasives as its paint cleaning component, so caution needs to be exercised when using it on any coated surface.
The reality though is that as long as the car is properly cared for (ie washed fairly regularly and dried correctly), then Amigo shouldn't necessarily have to be used. Certainly it shouldn't need to be used more than once a year or so.