Underbody protection

Hi first of all was a reader so far and today I have a question myself or. Stand before a decision what I should do I apologize in advance if I made a mistake so understanding thank you My Golf 5 Ed 30 has a bit rusty on the underfloor so easy Have seen a video of Gerhard Holzknecht where he first removes the rust with the wire brush then brunox on it after drying rope grease My progress is first with angle loop He removes the rust with a pot brush Then brunox and afterwards rope grease But I also heard the underfloor protection on synthetic resin base should be good Do almost everything myself with the vehicle from the joint to the tooth rims but honestly with the rust I don’t know and paint also I know that no paint can remove rust for life but want I have a few years rest Please thank me for your news first [From engine talk from the topic ‘Edition 30 Unterboden’ overfeeling Rt.]