Amazon has
15-Ounce Rust-Oleum Rubberized Undercoating Spray (Black) on sale for
$4.47.
Shipping is free w/ Prime or on $25+ orders.
Thanks to Community Member
david3808 for posting this deal.
About this Product:
- Perfect for use on bare or primed metal underbodies of cars, trucks, trailers, RVs and more
- Professional-grade formula provides superior protection against corrosion and damage from water, salt and other chemicals
- Dries to the touch in 1 hour and covers up to 10-15 sq. ft. per can
- Undercoating helps deaden sound and reduce damage to parts
- Features a wide, comfort spray tip and any-angle spray technology for easy painting even upside down
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Can I cover hood rust or only the underbelly?
Also, heat it up first before each application.
It stinks for a while...like a month. Take care to not get much on you exhaust or it will smoke a lot.
If you ever see a product like this sprayed on a frame, axle, etc., run away as fast as you can. Someone is trying to conceal rust damage.
For any coating to protect metal, it has to be able to stick to it and be the barrier between the metal and the air/water. The longer a product stays connected directly to the metal, the better. This applies to paint, rust convertor, and things like fluid film, lanolins or petroleum oils people use. They all have the same exact purpose and function and work the same way.
If that barrier breaks down and the metal is exposed and the rust returns.
Smooth clean well prepped surfaces are good candidates for paints. Dirty, rough, chipping, not good surfaces are ideal for oil based rust prevention. It would take a LOT of work and in most cases near impossible to properly prep a car body and frame areas good enough for long term paint adhesion. I've done paint on large areas of unibodies where very little is hidden and used paint but you can't get into nooks and crannies and inside boxed areas or crimped layers with paint. Think a modern boxed or stamped layered crimped control arm. There is no way you can "prep" the inside of that control arm for paint. Same goes for an already rusting crimp area like under the doors. It's almost impossible to paint the inner bottom of a door or a tailgate and those are open and routinely get water in them by design (make sure to keep your door drain holes clear).
Paints disadvantage is when sprayed on poorly prep'd areas or places it should not have been used, it can separate from the metal in a short amount of time exposing a small portion to the elements. Since paint can also stick to itself it can then create small hiding spots for water to collect between it and the metal trapping more moisture for longer periods of time than if there was no paint at all. Non curing rust preventatives unlike paint does not "harden" and can spread thinner and "absorb" into the areas and does not create those shelves and tunnels for water to hide.
That being said. This is a good price. Paint and undercoating should be one of the things in your decision tree for protecting metal but not the only one.
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Apply once a year in the fall and you'll vehicle will not rust out.
If you want to see what this stuff or any rubberized undercoating does to your vehicle https://www.youtube.com/watch?v=nXvl9nt
Example [youtu.be]
A larger than necessary wire nut packed with cheap wheel bearing grease and then wrapped with electrical tape (just to secure it) will last forever too.
Also, heat it up first before each application.
It stinks for a while...like a month. Take care to not get much on you exhaust or it will smoke a lot.
Agreed on the warming it up first, it really helps spray more evenly, as well as penetrating the tighter spaces in the chassis. I put the gallon container in front of my garage heater between refilling the sprayer, which seemed to do the trick.
I bought the recommended sprayer from amazon, the cheap $30 one with two hoses. It all worked out really well, and wasn't nearly as much work as I thought it would be.
Mask, goggles, gloves, ramps, ear plugs, and a hoodie you don't need to wear in public again.
Cosmoline is really bad for you.
RUST BULLET - Automotive Rust Inhibitor Paint - Rust Preventive Protective Coating - No Topcoat Needed - 4 oz Can, Metallic Gray https://smile.amazon.co
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If I wouldn't use it in a lawnmower I didn't care about, sure wouldn't put it on a truck.