so my most recent go-to has been AutoTech Rust Prep. pretty sure it's the same active chem as the rest of the paints, but just straight up by itself. leaves the rusty surfaces black and smoother. looks like you oiled it, but it's dry and hard. i believe it's converting the surface to something else.
wear gloves n eyes for this stuff
My procedure: (after some trial n error)
-clean the area with a wire brush or whatever to remove anything loose
-blow it off, then wipe it off with cleaner (i tend to brake clean
)
-sprits it all wet with the RustPrep
-wet a rag with the the prep (watch drips cuz they'll etch other metal n such) and wipe/sponge the whole area good to make sure it gets in all the nooks
-give it until the edges start to dry/cure (you'll start to see white residue showing up)
-sprits and wet a rag again and re-wipe the whole thing really good for a "2nd" coat
-let FULLY dry n cure (i try n leave it over night)
-fully clean off all white residue since paint will never stick to it. (water or paint-prep solvent)
-primer / paint
for something like inside the roof skin and panels i cant' get to ... i will probably just sprits that junk in there and forget about it. better than nothing.
https://smile.amazon.com/Auto-Tech-M...ps%2C95&sr=8-3
or the gallon:
https://smile.amazon.com/Auto-Tech-M...ps%2C95&sr=8-3
