Do You Sand Loctite Extend Spray Before Epoxy?

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PostPosted: Thu Apr 22, 2021 7:53 am
As the title asks, should you sand Loctite Extend spray before applying epoxy, or spray directly over it?

Thanks in advance!

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PostPosted: Thu Apr 22, 2021 8:32 am
Personally, I wouldn't have used it in the first place. The general consensus here is to "remove" rust and cut off it's oxygen supply (fuel) with epoxy. These converter style materials usually have some type of acidic component that can interfere with subsequent coatings like epoxy as well. I especially don't like this one as it says right on the label the word "latex" which has no place in the foundation of any auto style project...... others will comment I am sure......
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PostPosted: Thu Apr 22, 2021 10:17 am
:goodpost: :goodpost:

Generally Phosphoric Acid is used to treat rusted metal. Once the rust is converted (looks black) you apply another coat and immediately wash the area with soapy water to neutralize the acid. It will then be rinsed with clean water and the excess water blown out with compressed air.

Once dry you can prep the panel and apply a quality 2 part epoxy primer over it.
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PostPosted: Thu Apr 22, 2021 10:51 am
:goodpost:
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PostPosted: Thu Apr 22, 2021 10:56 am
'68 Coronet R/T wrote::goodpost: :goodpost:

Generally Phosphoric Acid is used to treat rusted metal. Once the rust is converted (looks black) you apply another coat and immediately wash the area with soapy water to neutralize the acid. It will then be rinsed with clean water and the excess water blown out with compressed air.

Once dry you can prep the panel and apply a quality 2 part epoxy primer over it.



:goodpost: :goodpost: :goodpost:

I am not familiar with this Loctite product he is referring too, BUT as You know I do use a lot of Phosphoric based products BUT ONLY those products Endorsed and Made for a Paint system, Mainly DUPONT now by AXALTA and PPG and only those products!
To go playing Backyard Chemist using products not endorsed by a Paint system is begging for a Paint failure!


There are WAY too many miracle magic Metal rust treatments out there that claim to be compatible with available Paint systems BUT yet don't say which Paint system they are compatible with??? The fact is They are NOT approved! under any Paint system by any Paint mfg. I am only aware of Dupont, Axalta and PPG products which ARE approved to be used under THERE OWN PRODUCTS for a complete System!

Mixing and Matching different Paint system and processes is a recipe for disaster and Paint failure! Paints are just way to expensive to take chances not too mention the labor involved, Pick a Paint system stick with it all the way through.
Last edited by Doright on Thu Apr 22, 2021 11:14 am, edited 1 time in total.
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PostPosted: Thu Apr 22, 2021 11:12 am
And, everybody is hitting my exact point here... we try to work within "systems" of applications and stay away from the big box hardware type of chemistry. Bad or unknown foundation= bad or unknown results.....
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PostPosted: Fri Apr 23, 2021 10:07 pm
Fair points, for what it's worth I actually got the idea of using Loctite Extend from watching Kevin Tetz recommend it.



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PostPosted: Sat Apr 24, 2021 5:46 pm
Kevin was better Back in the day when He was just making his videos.
Now Hes sold out and commercialized selling products, If you trust His opinion go for it.

I my self stick to a System start to finish, Paints just too expensive anymore to take chances.
Your Paint job is only as good as its foundation.
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PostPosted: Sun Apr 25, 2021 9:44 am
Doright wrote:Kevin was better Back in the day when He was just making his videos.
Now Hes sold out and commercialized selling products, If you trust His opinion go for it.

I my self stick to a System start to finish, Paints just too expensive anymore to take chances.
Your Paint job is only as good as its foundation.

This video was yeeeaaaarrs ago on an episode of Trucks...or Truck Tech...whatever it was called at the time. For some reason it has always stuck in my head.



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PostPosted: Sun Apr 25, 2021 10:22 am
Here is a follow up of a Guy who used Loctite magic rust stuff after 4-5 months.

https://www.youtube.com/watch?v=Iw01hW6fQBk

Only real cure for rust is cut it out, You can Blast and coat with epoxy but it too is not full proof.
There are some Phosphoric acid based Cold Galvanizing products that work great on minor surface rust but they are not good for any sort of pitted metal with out blasting.
Axalta and PPG make them they are labor intensive when doing a whole car or large panels you need multiple people and the stuff is not cheap.
But if you do it correctly the metal is actually Cold Galvanized and when followed by Epoxy it should in theory never rust again, unless the coatings are some how damaged.
Last edited by Doright on Sun Apr 25, 2021 10:45 am, edited 2 times in total.
Dennis B.
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