This is not meant to be a professional fix but is just meant to slow the rust process.
Car door rust repair.
Sand through the rust spots down to the bare metal using 40 grit sandpaper.
Rust inhibitor tends to dry quickly.
Regular inspection and repair of the spots that have worn bare will keep rust from advancing and causing additional damage.
Use a metal or plastic scraper and wear gloves to ensure none of the sharper chunks can stab or cut you.
Removing as much of the loose rust and paint as you can will make sanding much easier.
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Let me start by saying this is a temporary but cost effective way to clean up a troublesome rust hole on your car it s always best to replace panels or wel.
Enlarge the sanded area so you ll have space to feather the edges.
Switch to 120 grit sandpaper to feather the edges of the repair area.
With all the rust removed the exposed metal that s left is still susceptible to rusting.
Crack off any blistered pint with a scraper.
If this coating is not there consider adding one yourself.
Treat the exposed metal with a rust inhibitor.
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Spray the entire area liberally with the rust inhibitor to stop the spread of any new rust before moving on.
Still have to spot and grind a few welds then throw on some primer and be ready for some body work later on.
Just press the scraper into the rust repeatedly to free up any loose bits.