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  #1  
Old October 13th, 2019, 10:41
BALTANAKT BALTANAKT is offline
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Suggestions for undercoating?

Hey guys,

Re-coated the inside of my rear fenders using the professional grade Rusto stuff.

It went on super thin, so now I am thinking about doing another coat of something over top.

What is the best undercoating these days?

Is there anything that goes on thick and stays black?
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  #2  
Old October 13th, 2019, 11:04
RCP Phx RCP Phx is offline
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Re: Suggestions for undercoating?

If you have already applied one coat your pretty much stuck with whatever based the first coat is. What exactly did you apply?
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  #3  
Old October 13th, 2019, 11:34
BALTANAKT BALTANAKT is offline
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Re: Suggestions for undercoating?

Yeah I might end up striping it. Used this stuff.

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  #4  
Old October 13th, 2019, 11:56
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4x4JeePmaNthINg 4x4JeePmaNthINg is offline
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Re: Suggestions for undercoating?

https://www.amazon.com/3M-08881-Unde...a-384008867511


This, I doubt I'll try anything else
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  #5  
Old October 13th, 2019, 13:40
lawsoncl lawsoncl is offline
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Re: Suggestions for undercoating?

Quote:
Originally Posted by 4x4JeePmaNthINg View Post



I'm kinda skeptical about the description though:
  • Prevents valve seat damage in engines designed for leaded gasoline
  • Prolongs the useful life of older engines without updated valve seats
  • Also cleans carburetor deposits and injectors, safe for catalytic converters.
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  #6  
Old October 13th, 2019, 14:26
RCP Phx RCP Phx is offline
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Re: Suggestions for undercoating?

For over 40yrs I've had great luck with 3M Body Schutz but I don't believe it comes in a spray can. For better protection paint it with bed liner first.
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  #7  
Old October 13th, 2019, 20:49
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4x4JeePmaNthINg 4x4JeePmaNthINg is offline
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Re: Suggestions for undercoating?

Quote:
Originally Posted by lawsoncl View Post
I'm kinda skeptical about the description though:
  • Prevents valve seat damage in engines designed for leaded gasoline
  • Prolongs the useful life of older engines without updated valve seats
  • Also cleans carburetor deposits and injectors, safe for catalytic converters.
Lol thats an Amazon vendor quirk I guess.


https://www.3m.com/3M/en_US/company-...3242023&rt=rud

Ignore the different color can 3M 08881 is what im suggesting. The Amazon photo is accurate, but I wouldn't put it on anything other than undercarriages haha.
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  #8  
Old October 13th, 2019, 23:36
ijeeep ijeeep is offline
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Re: Suggestions for undercoating?

If you want heavy duty authentic no s#!t old school then Bituminous coating is what what your looking for. It can be brushed, rolled, dipped or sprayed. Also it can be thinned for use in touch up guns.
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  #9  
Old October 14th, 2019, 21:29
BALTANAKT BALTANAKT is offline
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Re: Suggestions for undercoating?

Quote:
Originally Posted by ijeeep View Post
If you want heavy duty authentic no s#!t old school then Bituminous coating is what what your looking for. It can be brushed, rolled, dipped or sprayed. Also it can be thinned for use in touch up guns.
Man, the only roll on stuff I see is $250.

Anybody ever use Flex Seal before?
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  #10  
Old October 14th, 2019, 21:39
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4x4JeePmaNthINg 4x4JeePmaNthINg is offline
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Re: Suggestions for undercoating?

Are you being serious? Ha? Cause that made me chuckle

When you ask for undercoating, what are you trying to accomplish?
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  #11  
Old October 15th, 2019, 00:40
ijeeep ijeeep is offline
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Re: Suggestions for undercoating?

Quote:
Originally Posted by BALTANAKT View Post
Man, the only roll on stuff I see is $250.

Anybody ever use Flex Seal before?
$250 ? Holy $#&* ! Time to check industrial and manufacturing supply houses.
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  #12  
Old October 15th, 2019, 15:45
BALTANAKT BALTANAKT is offline
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Re: Suggestions for undercoating?

Quote:
Originally Posted by 4x4JeePmaNthINg View Post
Are you being serious? Ha? Cause that made me chuckle

When you ask for undercoating, what are you trying to accomplish?
Trying maintain the underside of the XJ so it will never start rotting. So basically prevent damage from stones, rust formation, etc. Would be nice to have a product that was UV light resistant so it didn't turn gray within a year.

Overall the XJ is in such great shape, I hope to keep this thing forever, so trying to maintain it with that in mind.
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  #13  
Old October 15th, 2019, 16:39
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MG2000XJ MG2000XJ is offline
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Re: Suggestions for undercoating?

I just sprayed on my first coating of the Rustoleum rubberized undercoating yesterday, I am confident in one thick layer of the stuff but I will add a second coat when I get home. Why not just spray on multiple coats and keep it cheap? I prepped, painted and then sprayed the undercoating. Seems sufficient enough to battle Salt Lake winters in
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  #14  
Old October 15th, 2019, 19:09
furrydogs furrydogs is offline
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Re: Suggestions for undercoating?

Quote:
Originally Posted by MG2000XJ View Post
I just sprayed on my first coating of the Rustoleum rubberized undercoating yesterday, I am confident in one thick layer of the stuff but I will add a second coat when I get home. Why not just spray on multiple coats and keep it cheap? I prepped, painted and then sprayed the undercoating. Seems sufficient enough to battle Salt Lake winters in
Hey MG2000XJ, what exactly did you do prep wise? Like the OP, I have a 96 in great shape and want to add a layer of protection so I can keep this for a loooong time.
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  #15  
Old October 16th, 2019, 06:44
Jrgunn5150 Jrgunn5150 is offline
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Re: Suggestions for undercoating?

I use toliet wax rings chopped up and disolved in mineral spirits. I usually cut it with a little drain oil or something.
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