Thought on undercoating?

[Aircal]

Bringing in a very low mile Florida car. Thinking about undercoating it as we use more salt than we get snow here. Any thoughts yea or nah? Any recommendations diy or shop?

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[ProjectGTP]

I've always thought about this.

 

[Dan00Hawk]

My concern would be plugging up factory drainage holes that would allow water and salt to collect in areas that it normally wouldn't. I don't know how that gets addressed...

 

[Bub]

i've never seen a point

 

[Aircal]

i've never seen a point

My 73 Thunderbird was done back in the day and it stayed rust free underneith.
My grandparants 74 Monte got the Rusty Jones treatment back in the day, and the current owner still shows it.
I see so many 2000-2005 with really bad rust up underneith. Most arn't saveable.

 

[Turbocharged400sbc]

seal all seams that dont have unsealable water entrances.
spray everything with oil making sure to avoid rubber bushings
you can pop door panels and pullback plastic liners/trim and get behind and coat everything
then park in front of some random house for a few hours if you forgot to put down cardboard on yours

oil is better than most undercoating/sealants that sit on the surface and never creep into the body seams where the rusting starts at the perimeter of the spotwelds

alot of newer cars do have pretty good anti corrosion, it really only rears its head externally in the case of repaired body/accident damage.

if you know its prev owner/history all the better.

ive been under lots of cars and the rust free one's were from the south or had massive oil leaks early on in life

when a northstar caddy would leak from the skirt gasket they always did a good job rustproofing the underside

 

[Stink Star]

Easiest way to prevent undercarriage rust is to park in a garage with a concrete floor and to wash your car often in the winter

 

[Mike K]

Easiest way to prevent undercarriage rust is to park in a garage with a concrete floor and to wash your car often in the winter

Why specifically a concrete floor?

 

[Stink Star]

I had a customer today who had an older garage with a gravel garage floor and all of their suspension arms and brake lines were rusted through