Rust Question

[jonj1611]

Currently tackling some surface rust but something has been bothering me and info seems sketchy so hopefully someone will know.

I am wire wheeling the surface rust, when removing the flaking rust etc you should take it back to where good metal begins, so here's where I am getting unstuck. Hydrate 80 will convert the surface rust and leave a protective barrier but what about the good metal that has been exposed? This is underside of the car so exposed to everything. I am putting some epoxy mastic on but its on order and 2 weeks away, the car isn't being driven until the work is done but at the same time I don't want moisture etc to start attacking the good metal.

So after I have applied the rust converter and its fully dry etc should I put some grey/red primer on? And then the epoxy mastic?

[dezwez]

that's what I would do stop any new rust😊

[jonj1611]

Cool 🙂 Yes thought it was the way forward, any difference between red and grey primer does anyone know or is it all the same? I have seen that rust prevention primer. Wasn't sure if that would be any better

[jonj1611]

Right, had a rethink on this, its a 13 year old Focus, it will probably only last another few years anyway.

Once I have applied the Hydrate 80 does anything need to  go on top of that or is it safe to be left as it is. I know its the chassis but wondering the protective coating the Hydrate 80 leaves is enough or if I need something extra and if so what. Not sure I want to go to the hassle of epoxy mastic, its only a few rust patches here and there