POR-15, or something better?

[Dsertdog]

I'm looking for something to seal and convert rust on the interior floor pan.
POR-15 was the standard once, but many failures have been documented so I'm looking for better alternatives and don't want to read countless web site pitches.

The rust will be wire brushed and any porosity in the steel will be cut out and patches welded in. But I'll need something to coat the treated steel any freshly welded patches. I only want to do this once and cover it with sound insulation.

Any suggestions?
Thanks!

 

[CanCritter]

Rust Bullet
https://www.rustbullet.com/automotive-applications

 

[69psf]

I'm currently restoring/patching floor pans in my '69 Sport Fury. Mine is an AC car which means the floor pans stayed were wet from the AC condensation. The areas I'm saving were stripped bare and any rust left over was treated with Rust Reformer from Rustoleum. Stops Rust® Rust Reformer Product Page. Seems to work quite well

 

[jason99]

Here’s a couple of semi relevant opinions about floorpan/trunk repair.

https://www.forcbodiesonly.com/mopar-forum/threads/cleaning-up-floorpans-trunkpan.41707/

https://www.forcbodiesonly.com/mopa...loor-pan-for-a-67-chrysler.16410/#post-232712

 

[62dodge]

I'm sold on vinegar its less destructive and cheaper than any other rust destroyer. i

use apple cider vinegar as the smell is more pleasant

 

[mr. fix it]

I liked the Rust Bullet product.

Easy to work with
Lots of time to work it into the metal
The can can resealed with the inert spray gas(Bloxygen) you can buy to preserve the opened product.
The gloss black is tough as nails too
I used the silver on the firewall & both silver & silver then gloss black on the stub frame as shown here.

 

[Dsertdog]

I liked the rust bulletk product.

Easy to work with
Lots of time to work it into the metal
The can can resealed with the inert spray gas you can buy to preserve the opened product.
The gloss black is tough as nails too
I used the silver on the firewall & both silver & silver then gloss black on the stub frame as shown here.
View attachment 289937

What inert spray gas? I don't see that on the web site under automotive!

 

[Samplingman]

There is no one product, but a process and a combination of steps. POR-15 is just an encapsulator, it doesn’t convert rust. It should be the last step, not the first. I don’t have experience with Rust Bullet, but I think it has similar properties. Evapo-Rust, vinegar, and Rust Dissolve (phosphoric acid) etch and remove rust. Don’t forget to neutralize with water. I’ve seen good results with electrolysis. Converters chemically harden and allow rust to be painted in areas where mechanical and chemical process aren’t practical.

Brand names are a personal choice and hard to recommend, most of them do the same job, but have more or less expensive marketing.

Cut and weld, wire brush, etch, convert what’s left and then encapsulate. You will have a solid foundation and not have to worry about it again.

 

[BLUPORT]

Wire brush, phosphoric acid soak, clean, POR-15, and be done.

 

[mr. fix it]

What inert spray gas? I don't see that on the web site under automotive!

here you go.

Bloxygen Blocks Oxygen, Protects and Preserves opened Rust Bullet Coatings During Storage. Bloxygen uses ultra pure Argon, an inert gas, to drive the oxygen out of partially used containers of Rust Bullet Coatings and preserve the paint for future use.
Rust Bullet General FAQ's

https://www.rustbullet.com/index.php/downloads/dl/file/id/125/general_faq_s.pdf

 

[5wndwcpe]

Epoxy.

https://www.southernpolyurethanes.com/6620

 

[BillGrissom]

First, it is a myth that rust is like cancer and will inherently spread. The problem is that it provides porosity to allow moisture to reach bare steel. I agree w/ the above on eliminating as much loose rust as possible - down to shiny black steel, then a chemical that dissolves rust. Evapo-rust works best if you can submerge a part in it. If not, you must keep wet and covered w/ plastic for several days. POR-15 is very expensive. I have used Rust Destroyer, which comes in cans and spray. Used to be sold at Ace, but now you must buy at a specialty paint shop. It both converts rust and etches bare steel as a primer. Rust hasn't returned, but I have babied those cars.

Re epoxy coatings, that is what Delorean Motors tried to realize a lifetime frame (epoxy coated steel) to complement their stainless body panels and exhaust. A British sports car (TYR?) did also w/ tubular steel. Both were horror-stories. There were small gaps in the epoxy coating from the factory, plus a rock strike exposed bare steel. Moisture then was drawn into the steel-epoxy gaps and caused much faster corrosion than if the parts had just been painted. Stories are that Delorean frames were rusting as they sat on dealer lots.

 

[1970cat]

i used kbs
KBS Coatings - Rust Prevention - Stop Rust Paint - Gas Tank Sealer - Clear Coat Paints
two good coats and it will dry very hard. i just put some on the bottom of my lawn mower deck.

 

[Dsertdog]

I like the idea of using Apple Cider Vinegar. It has a higher acidic contact than white vinegar and smells better!

I got this strut arm from Mr. Murray Park. Covered it with blue shop towels, stuck it in a trash bag, and inundated the towels with vinegar. I wrapped up the trash bag and let it set about 48 hours, then removed the wrap.
I took a piece of balled up aluminum foil and rubbed the part down. then rinsed and dried it.
The results are shown below. The shiny areas were wire brushed using a drill press.

There's obvious pitting, but any rust encapsulator will need a rough surface to adhere. Personally I believe the results were impressive!
I'm looking forward to using vinegar on the floor to get rid of the rust and prevailing musty odor as well.

 

[Dsertdog]

Ordered in some Rust Bullet products today and can't wait to try them.
Thanks for everyone's help