First of all, good eye! Gas tanks are common areas for rust to grow. The earlier you find and eliminate rust, the better. Even a small rust spot can quickly become a big problem, eating through your car’s body and corroding your exposed engine parts.
You can fix a small rust spot with a paint touch-up kit, a sanding block, and some rust protectant.
Here are the basic steps to follow:
Wash and dry the area completely with a mild detergent
Use a sanding block (fine grit, between 320 and 400) to remove all the rust in the affected area
Wipe the area clean with a soft microfiber cloth
Apply rust inhibitor to the whole area and dry completely
Use a paint touch-up kit to apply primer, color, and topcoat to match the rest of your car
Here, you can find a complete guide
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