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Originally Posted by QShip
I like to use PB Blaster or WD-40 under my truck. A buddy of mine uses the silicon dressing. He said he's been doing that for years with no rust.
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OK..Let me try to make you understand that these products are nothing nothing more than water displacers that will only last a short time...
WD-40 stands for Water Displacement 40th attempt.
When the product is wet, it creates a surface tension tension that is like a sponge that will trap contaminants. These contaminants, like salt, iron, fallout,road grime etc...will attack the frame....
Here's what happens... You spray it on and it stays moist for a few days...as it drys it picks up every thing under the sun and adheres it to your frame in every nook and cranny. than you clean it where you can reach by bending over and spraying what you can easily reach with the gun...Then you reapply and the process begins again.
Here's the problem...The areas you can't clean become the theater of engagement for the corrosion process because the moisture you're trying to displace becomes imbedded in the gunk that you've collected and directly attacks the metals at an accellerated rate.
Like I said above, Clean and dry is the best way unless you plan on sealing your undercarraige with a professional coating.
I professionally advise not doing this.