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  #1  
Old August 4th, 2019, 14:35
asymptonic asymptonic is offline
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DIY Undercoat

I'm having to have some unibody work done due to an idiot rear-ending me. They will likely be cutting a tiny bit for the repair, and I'll bet anything I'll have bare spots down there...


What do y'all recommend as an undercoat to keep rust away that I can apply myself to a small area. I'm in TX so this isn't mission critical but I do want it to last.
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  #2  
Old August 4th, 2019, 16:30
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Tim_MN Tim_MN is offline
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Re: DIY Undercoat

If you do not drive on oceanside beaches or on snowy road salt treated roadways, any paint will be fine. I would use POR-15 or something similar.
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  #3  
Old August 4th, 2019, 20:16
asymptonic asymptonic is offline
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Re: DIY Undercoat

I have some Rustoleum rust converter and some exterior oil based paint that I used in a pinch. Por-15 is hard to find in small quantities, right?
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  #4  
Old August 4th, 2019, 20:21
asymptonic asymptonic is offline
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Re: DIY Undercoat

NM, its easy enough to find online, though not super cheap.
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  #5  
Old August 5th, 2019, 06:58
CJR CJR is offline
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Re: DIY Undercoat

I've used POR15 in the past. Now I'm using water-based Rustoleum black epoxy, w/activator, on an off-body 72 Jeep Commando resto and like it alot.

Water clean-up and slight water thinning is also nice.

Best regards,

CJR
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  #6  
Old August 5th, 2019, 09:01
Heavyopp Heavyopp is offline
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Re: DIY Undercoat

Take a look at Chassis saver -- Same idea as por15 but cheaper
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  #7  
Old August 5th, 2019, 17:10
asymptonic asymptonic is offline
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Re: DIY Undercoat

Quote:
Originally Posted by CJR View Post
I've used POR15 in the past. Now I'm using water-based Rustoleum black epoxy, w/activator, on an off-body 72 Jeep Commando resto and like it alot.

Water clean-up and slight water thinning is also nice.

Best regards,

CJR

Is epoxy not too rigid for this? Feels like it would crack.
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  #8  
Old August 5th, 2019, 18:41
CJR CJR is offline
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Re: DIY Undercoat

Asymptonic,

Answering your question on the flexibility of epoxy is not so easy. Twenty or thirty years ago there were about 800-900 formulations for epoxy. Today I would guess there are thousands and thousands of epoxy formulations. If it doubt on your application, discuss using the Rustoleum water-based epoxy "5300 System" with Rustoleum and see what they have to say.

Best regards,

CJR
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Old August 5th, 2019, 20:24
asymptonic asymptonic is offline
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Re: DIY Undercoat

Thanks. Knowing its the 5300 system helps, I'll look at the material data. Completely understand your point about the formulations and applications.
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  #10  
Old August 7th, 2019, 08:05
BALTANAKT BALTANAKT is offline
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Re: DIY Undercoat

POR-15
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  #11  
Old August 7th, 2019, 09:54
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4x4JeePmaNthINg 4x4JeePmaNthINg is offline
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Re: DIY Undercoat

I read a guys build where he used top secret coatings on his rig and seems to like it. I think it's marine based so fairly durable.


I believe por-15 is supposed to be painted over as well, it at least no exposed to UV.
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Old August 7th, 2019, 12:30
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Re: DIY Undercoat

I used the Rustoleum spray undercoating on my rear wheel wells after doing a cut and fold. I'm on the Texas coast and it seems to have done the job fine.
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  #13  
Old August 7th, 2019, 17:11
asymptonic asymptonic is offline
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Re: DIY Undercoat

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Originally Posted by IslanderOffRoad View Post
I used the Rustoleum spray undercoating on my rear wheel wells after doing a cut and fold. I'm on the Texas coast and it seems to have done the job fine.

Galveston? Sounds encouraging. How long has it been on?
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  #14  
Old August 7th, 2019, 18:45
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Re: DIY Undercoat

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Originally Posted by asymptonic View Post
Galveston? Sounds encouraging. How long has it been on?
About a year.

Iím in Houston but go to Galveston a lot
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  #15  
Old August 8th, 2019, 00:39
tm8chris tm8chris is offline
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Re: DIY Undercoat

Aside from being cheaper than por15, Chassis Saver is a one-step process.
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