My 2002 F250 is showing some surface rust on the underside of the body where it's unpainted and I would like to stop it before it gets bad. I've heard of POR-15 which you paint on over rust, but does anyone have any experience with the stuff? I've watched too many of my Ford trucks suffer rust cancer up here in MA to let another one go. This one still has a chance!

 

POR15 requires a cleaner and a preper to get it to adhear correctally, and then a top coat.

There is a product that is simular, and doesn't involve the cleaner or preper or top coat called silver bullet.

I have used por15 and it worked good for me, but I think the silver bullet would work good too. Both products would require 2 coats.

If you want more info on POR15, just ask, and I can tell you more.

 

i have also used a product called Zero Rust. did my frame with it. looks great. supposedly as strong as por-15 , but i don't know for sure

 

Totally agree, ZR is great for chassis and hidden metal, different colors too. Do have to let it DRY well between coats tho. .

 

I only plan on putting it on the underside of the body, so it wouldn't be visible at all so that's not an issue. With the POR-15 do you really need to purchase their prep product, or could you just clean the area with a solvent like brake parts cleaner?

 

here Zero Rust is about 1/2 the price of por-15. that was my deciding factor

 

You could use what ever you want to clean it, but you need the metal ready to get it to adhear properly. Try the zero rust it would prolly work fine for the money.

 

Actually, you do NOT need the Metal Ready in order for POR-15 to adhere. I've painted it on bare metal, metal treated with Metal Ready and metal treated with Ospho.

Metal Ready, Ospho or any of these rust converters (phosphoric acid) products are just an additional step helping prevent further rust. The best thing about them is that they are very liquid and can get into more place that the heavier paints can. I know that all of these rust preventative paints say you can just paint over the rust, but I personally like the added protection.

 

They also sell a paint called "Chassie Saver" and I have used it and love it. Its alot cheaper then por15 and silver billet. you can get it in black silver or clear. I like it and always will use it. You can get ti from your local carquest parts store. Thats where I get mine at.

 

POR clearly says that you need the conditioner- especially with bare metal-ie no rust. The stuff loves rust but not clean metal. Go to their site or to a dealer to get a catalog. There is a lot of chemistry in what they do and different levels of protection. POR when used in the 4 steps is considered to be the best. That doesn't make it necessary.

It's all I use now.

 

I used to live in OH and know what you mean about rust . I rebuilt a 1980 bronco ( read rust bucket) it was really rough but I used POR-15 on the complete underside frame , floor , suspension . All I did was wire brush ,degrease then paint I did it with a brush.This bronco was all rust no bare metal but the rust never came back. Drove it for three winters plus four wheelin. I am sold on the stuff. Dont forget that some of the POR-15 products react to sunlight and must be topcoated. But for under the truck I wouldn't worry about it I didn't.

 

There's a comparison article that looks at POR-15 and Eastwood's Rust Encapsulator at:

http://www.eastwoodco.com/jump.jsp?i...88&iSubCat=852

Article's posted on Eastwood's site so you can go ahead and guess which product looks better