Trying to get some Phosphoric Acid to treat my
floor boards.

Told that Ace hardware has it.

They don't have it but can order it. I need a Part number.

Where else can I get it.

"naval jelly"

'nother product called 'ospho'. I used it on some rusty floor pans and it worked pretty well.

Ace carries it as ospho. Green liquid in a clear plastic bottle. Made by skyco.

Jasco makes a product called "Prep and Primer" which is phosphoric acid. You can find it at Lowes or Home Depot in the paints/thinners aisle. Works well (eats concrete too).

Coca Cola...............

Seriously, coke still has it in and I have used it for cleaning parts etc, but in reality just get the real deal as it is much quicker!!
Metal-ready, ospho, and many of the rust cleaning products are all phosphoric acid

If you go to an auto paint supplier they will probably have many different brands.... POR-15 has phosphoric acid in it but is a paint based product. I personally use SEM Rust mort. The hardware stores should have it in the form of "Rust Proof" Paul Harvey used to advertise it for one of the hardware chains.

Concrete cleaner/etcher is typically phosphoric acid.

We use it for swimming pool chemcials, Stain and Scale control
Works very well.

Hey Kam*Cuda is that your car in the pic? if so what kind of wheels and suspension did you use?

most welding supply houses carry it as aluminum cleaner.

I use concrete etch. Read the label to make sure it is Phosphoric
Acid some are using a different acid.
I also use a great product called Krut Kutter the must for rust.
I found it at the Home Depot, it's a phosphoric acid based metal cleaner protector. Up here they are pulling the product because they say it's too auto related and not selling enough,.

My wife's cooking usually has it