Tips To Protect Your Car's Undercarriage From Rust

Treating the undercarriage of your car with a rust sealant can help protect it against the damage caused by roadway salt and other contaminants. If you've decided that you want to do this, it's important that the process be done correctly, otherwise the metal surfaces won't be adequately protected. Here's a look at what you need to know.

What Areas Can You Treat? 

Rust sealant can be applied to most any surface on your undercarriage except for the areas that get hot when the car is running, such as the exhaust system. Before you apply any sealant, cover the exhaust with packing paper so that it isn't exposed to the product.

In addition, you shouldn't apply the sealant over an area where there's rust present. That simply seals the rust in and allows it to continue damaging the metal. Lift the car up on ramps so that you can examine the underside. Take time to wash the undercarriage completely and sand away any rust that you can see. You can even use an engine cleaner to ensure that you eliminate all of the residue.

How Do You Treat It?

The first step is to ensure that there's no rust anywhere that you cannot see. Treat the whole undercarriage with a rust removal product. Then, apply the rust inhibitor over the surface of it. Apply it in thin, even coats so that you get everything. Consider using a sprayer to ensure that you get even coverage and reach those smaller crevices. Keep in mind that the sealant will be somewhat sticky, so wear protective clothing and gloves when you work with it.

How Do You Patch Areas?

If you're concerned about even coverage or you feel that you need to apply a patch of further coating on some areas, you can do so easily with a small paintbrush. Work in small areas and use even, smooth strokes with the brush to ensure proper coverage. Like with the full application, tape off anything that can get hot when the car is running, then remove that covering after the coating is dry.

The more proactive you can be about protecting your car from rust, the longer the car will last you. In addition, when you prevent rust from damaging the undercarriage, you preserve the car's resale value much longer. In areas where road salt and other corrosive elements are prevalent, this can make a significant difference in the value of your car over time. If you're not comfortable treating the car's undercarriage on your own, talk with a local auto body shop about doing it for you.

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