I posted earlier about proper way to care for a car that has paint protection film on it and several people recommened Gtechniq. I youtubed it and the application and use seems super easy, but did not realize that it was actually a sealant. I have heard that sealants have a notorious margin for error. Is this product really that easy to use? If so I am going to place an order, but if not... is there something else I need to consider?