I have just acquired a 55 chev 210. Rusty little devil. It is going to be some time before I can begin real work on this car. But I want to stop the existing rust till such time I can begin. What is the best approach to accomplish this ? I don’t want to put any thing on it that will not be repairable/compatible with primer putty ect later. And can you sand and or grind these products? Thanks Mitch