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Where can I purchase phousfuric acid to derust my pickup?

Here is a link for phosphoric acid
http://www.prp-porstore.com/POR-15-Metal-Ready.html

Lowes and Home Depot sell it in the paint section. Comes in a plastic bottle and looks like barber shop disinfectant. Just spray it on and let dry. It has a stink to it and feels greasy to the touch. Use caution though as it is an acid compound. Should turn the metal black with a chaulky overspray.

I couldn't find it at my local Home Despot or Lowes. Perhaps this is a regional issue. I've heard that costal areas carry the stuff - widely used on boats I understand.

Seems hard to find recently for some reason, it is called 'metal prep' or 'rust converter' sometimes - check your local shops and look at the labels to find phosphoric acid. Not that the ingredients list will show anything more than 'acid' or the like!

I finally found a product at my local Tractor Supply store - cheap too! NAPA has a product that is phosphoric acid with an encapsulator that I use as well - it's meant to ne brushed on.

If you haven't used this stuff before, be careful. Using a respirator is a really good idea. Very Good eye protection is essential too.

Today I was using a spray bottle with phosphoric acid. I couldn't find my good eye protectors so I used standard shop safety glasses. While applying, a shot of the stuff hit me in the eye!

I got to the faucet FAST to flush my eye out, and then rinsed my eye with baking soda in water. I think all is OK but my eye does not feel good tonight.

It's prudent to have a suppoly of clean water close at hand, and also a container with water mixed with baking soda for a quick neutralize.

Most any hardware store has it, and I'm sure HD & Lows have it, but the teenage kids can't stop talking to each other long enough to learn what to look for and where to find it. Ask for Naval Jelly, which is the brush-on form of what you're looking for. It's usually in the paint department, but sometimes in the cleaning supplies. And some states don't allow the sale of phosphoric acid.

I use both Naval Jelly and the liquid form depending on what I'm doing. The Jelly is just to keep the acid in place while it does it's job.

It seems that the white, chalky residue happens when I leave the acid on too long. The chalky stuff is kind of hard to remove and a real hassle. I'm thinking 2 minutes is about right, but 5 minutes is too long.

I've also seen a green residue when I've done a light wipe of the liquid and forgotten to wipe it back off. Not sure what's happening in this case.

Here is a good source for a commercial preparation.

http://autobodystore.net/Merchant2/merchant.mvc?Screen=CTGY&Category_Code=RCAC

On the subject of phousfuric acid I have used it on my truck and the directions on DuPont 5717S metal cond. says to rinse with water and when I do it forms a coat of rust immediately. Any suggestions.
Thanks Paul

taz101, if you're going to rinse off the metal prep with water, it must be IMMEDIATELY dried. Use an air compressor or hair dryer for seams you can't get to. Some metal preps recommend rinsing and some do NOT. I would suggest using a product that does NOT recommend rinse with water.
An excellent site for professional advise on autobody paint and prep is www.autobodystore.com IMO

The phosphoric acid product available here is called Rust-mort. Don't skimp on the respirator. You want high quality filters, even when using this stuff outside.