You need to remove all of the rust prior to repainting the surface.
Roof frame rv rusted.
They will fully sand the frame to remove rust and smooth out any damage.
When a surface is rusted it continues to trap water will flake and then continue to rust.
For severe rust which covers a large percentage of the frame or has begun to cause pitting or scaling on the metal a body shop like central body co inc is your best repair option.
After years of driving the tubing can become filled with rust dirt and gravel allowing for moisture to soak and eventually rotting out the frame.
The key to repairing surface rust on your rv is in the preparation.
An rv specialist can blast it off repair any damage and then paint the undercarriage with a protective coating but having him do this job will be extremely expensive.
Keystone rv raptor roof dealer must have pulled it to lot through salt and parked it without washing salt off.
If you don t remove t.
When i got it home crawled under unit to check things out rusted frame rusted stabilizer jacks rusted gas line fasteners.
Once this is complete the entire frame is painted with a rust resistant primer.
You can flush water through the frame then follow up with compressed air to help the inside dry.
Keystone must put the thinnest coat of paint possible on frame.