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Old 07-08-2008
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Painting underbody

I knocked off the big stuff with a wire wheel and sprayed everything underneath my truck with rust converter so right now its all flat black primer [since 90% of the underbody was rusted], I just bought a can of this at lowes and was going to topcoat everything. Think it'll hold up?



I opted for the brush on rather than spray can cuz I thought it'd be more durable. And I only bought a quart and after lookin under my truck I know I'll definately need more.
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Old 07-08-2008
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I thought about doing this when I do my BL. Let me know how it works out!!
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Old 07-08-2008
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Yea you'll go through more than a quart, i'm about half way through painting my frame.
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Old 07-08-2008
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Originally Posted by My91Ranger View Post
Yea you'll go through more than a quart, i'm about half way through painting my frame.
Ya about how much paint do you think your gonna use? more than a gallon?
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Old 07-08-2008
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I used the undercoater in the can and it looks great! it took a few cans but it was worth the costs to see the results.
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Old 07-08-2008
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I'm going to end up using about 2 quarts total, which includes painting my engine compartment when I had the motor out.
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Old 07-08-2008
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i only use spray can paint because i hate it when paint builds up on bolts and you cant get the socket on to take the bolt off.
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Old 07-08-2008
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i only use spray can paint because i hate it when paint builds up on bolts and you cant get the socket on to take the bolt off.
That did occur to me, maybe ill spray can the areas where bolts routinely come off
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Old 07-08-2008
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i undercoat every car i get i all ways use rustoleum spray paint
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Old 07-08-2008
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i undercoat every car i get i all ways use rustoleum spray paint
You do know that undercoating holds rust in, causing whatever you sprayed to rust from the inside out to the paint...
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Old 07-09-2008
bryan240sx
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Originally Posted by 01xltranger4x4 View Post
You do know that undercoating holds rust in, causing whatever you sprayed to rust from the inside out to the paint...
That's not true with properly applied undercoating. Rust requires oxygen and moisture. If a coating effectively seals out both of those, rust will not occur. Further, the underside of the vehicles is painted already from the factory, which makes it even less likely to happen, especially if the car doesn't have any rust on it. This is a matter of science and is really not up for debate. No water...no oxygen...no rust.

The surface must be cleaned thoroughly prior to any coating being applied. It also must be dry. Surface preparation is vitally important. If any part of the coating gets chipped, just like the paint on your car, you must have it touched up.

The likelihood, in normal driving, of anything chipping through an undercoating and then chipping the paint is slim. If you do a lot of off roading or otherwise are scraping the underside of your vehicle then yes, it can happen more often. Most rocks and stones will just bounce off.

Since you already have rust in place, it would be wise to remove it, paint the surface (sprayed like factory) and then undercoat for appropriate protection. If you just undercoat after sanding off all of the rust, you don't have the factory protection underneath the undercoating and it makes you more prone to rust.

I would highly recommend your undercoating be applied professionally to ensure accountability, warranty, and quality of workmanship.
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