Undercoating question..

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PostPosted: Tue Jun 11, 2019 1:34 pm
I’ve looked around at rubberized undercoatings but I haven’t found any 2 part products which leads me to believe they aren’t durable. I could definitely be wrong about that though.

With that said I’ve got 2 cars with factory undercoating. One is an 88 Chevy and the other is a 2008 Toyota. Both undercoatings are actually still holding up. The Chevy is only showing minor issues that are due to the seam sealer underneath failing, and is still biting pretty hard every where else. Are the factory coatings a single part product?

I’ve been thinking of using some basic undercoating over some fresh (in recoat window) epoxy primer to see how it holds up on a test panel.



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PostPosted: Wed Jun 12, 2019 1:47 am
I've used undercoating on some older cars, basic stuff. It works fine but takes very long time to dry so you just cant wipe it off. Problems occur when it gets old and hard thus crack and let moisture in causing rust.

On my last project i striped the whole undercarriage, painted with por15 then undercoating. Worked well.

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PostPosted: Wed Jun 12, 2019 9:51 am
I have used this product and it does have a hardener.
https://www.raptorliner.com/store/p1/RA ... y_%29.html

Spray epoxy primer over your bare metal and then shoot this stuff.
1968 Coronet R/T


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PostPosted: Wed Jun 12, 2019 9:00 pm
^^^yeah that’s what I’ve planned on using but I was hoping to find something somewhat soft to lessen rock noise. I’m assuming it’s hard as other bedliners. I’m wanting something for wheel wells, I’m not sure if I mentioned that.

Dokus wrote:I've used undercoating on some older cars, basic stuff. It works fine but takes very long time to dry so you just cant wipe it off. Problems occur when it gets old and hard thus crack and let moisture in causing rust.

On my last project i striped the whole undercarriage, painted with por15 then undercoating. Worked well.


Yeah I’m wondering if the epoxy would provide a good chemical bond to make it hold on. Whatever process they used in 88 was a **** good one because it’s holding up great.

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PostPosted: Wed Jun 12, 2019 11:17 pm
Check this out: http://www.restorick.com/proddetail.asp?prod=Undercoat
1968 Coronet R/T


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PostPosted: Thu Jun 13, 2019 3:55 pm
'68 Coronet R/T wrote:Check this out: http://www.restorick.com/proddetail.asp?prod=Undercoat



Any personal experience? The price isn’t bad

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PostPosted: Thu Jun 13, 2019 3:59 pm
No sir, I haven't used that product yet but considering it for the 1968 Plymouth GTX I am working on.
I would imagine an internet search would produce some reviews.
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PostPosted: Thu Jun 13, 2019 4:02 pm
Here is another but imagine the pricing will be higher: https://www.3m.com/3M/en_US/company-us/ ... 345&rt=rud

Amazon has it for around $30 per quart.

Here is a no-name brand: https://www.amazon.com/Automotive-Rubbe ... VY1X4JYHX4

Gets great reviews.
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PostPosted: Sat Jun 15, 2019 12:49 pm
Thank the prices for the product on amazon aren’t bad either. My problem with reviews on places like that is usually it’s just the average joe who doesn’t know much about cars reviewing the product but the reviews for that product seem trust worthy.

I’ve got to spray some epoxy later and I may do a test panel with some rubberized coating i got for free a while back. I’ll scuff an old panel, spray epoxy, then apply the undercoating within window and I’ll see how tough it is. If this product works I think I have enough to do all 4 corners.



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PostPosted: Thu Aug 22, 2019 6:52 pm
I used an old quarter panel for a test and cleaned and scuffed the back side then sprayed with epoxy. I waited til later that evening then sprayed on the rubberized undercoating. It hardened up more than I thought it would but looked great, was tough and bonded well. It stayed looking nice for over a month but today I checked and it’s cracking all over.

https://m.atcointernational.com/prod-56 ... -black.htm

This was the product. I tried to upload pics of my results but the site is giving me problems.
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