This isn't a classic car question as such but it's something that classic owners have to deal with and may have experience with
My mother's 12 year old renault is showing some surface rust on the chassis/floorpan. It's not bad but if nothing is done with it it will probably get worse. So I'm going to try treating it. I think have a pretty good idea of what to do:
1) Clean all dirt and grime from the metal to be treated
2) Scrape off all rust and flaking paint with wire brush and sandpaper
3) Apply "rust inhibiting" primer, rub with fine sandpaper
4) Apply top coat(s) and laquer
5) Apply underseal/waxoyl
Have I left anything vital out. Also, here's a couple of questions:
-is it even a good idea to treat surface rust on a galvanised modern car. Will scraping back to clean metal and repainting actually damage the galvanising which was done at the factory and do more harm than good
-I'd guess that the primer application is one of the most important aspects of the operation. Halfords sell Hammerite primer which is advertised as being a rust inhibitor. Is this stuff any good? I have heard that it's not great and that I should look for something called Corroless Red which is used as rust inhibiting primer on oil rigs Sounds like overkill. Has anyone any other recommendations?
-is this rust treating project of mine something that can be done outside or will the humidity in the air get trapped in the paint and feck things up. Also, I don't have access to any special equipment like sprayers etc., all painting will be done using brushes and spray cans. Will this cause a problem. Obviously, since the areas i'll be treating are under the vehicle, the job doesn't have to be perfect as no-one will see it. However if it goes well the next thing i'll try is treating rust on the upper body that can be seen.
Has anyone any thoughts