Likely just rust under the POR and it will just peel back off in chunks. Only time it works really well, is clean metal. You need something to convert the rust first.

I agree, the frame itself looks pretty solid, though the moisture will get into the crevices and rot it worse where two parts mate. The initial moisture from sitting just chipped off the worthless factory frame paint. It doesn't take much. My guess is the oil pan is ready to start leaking too. That was a very common problem too.

 

I don't think you have much to worry about, looks pretty solid. If yo have a compressor and a needle gun you could descale the frame very quickly, lightly give it a go over with a wire brush and wipe it with a de-greaser then brush a product called DOM 16 made by Dominion Sure Seal. The product is pretty much the same thing a POR15 but about half the price.You've picked up a very nice looking truck..

 

In the very first pic you posted, those aren't multiple tiny little holes?

Plenty of salt and Lawyers in s/e Michigan. You would think they air drop salt on the roadways. ABSOLUTELY, no reason for a 4x4 here. Its disgusting.

I agree hit it with a scaling hammer or an air scaler.
I'd run it. You'll probably get more life out of it by towing than hauling.

 

Funny you should mention that because it is certainty about to rust through. I was thinking about putting putty over the area to pre-seal it. Do you think that'll work?

 

Putty will just pop off, stuff like that only works for MacGyver

 

 

Is that painted or powder coated, looks good..

 

 

I sandblasted mine and put 2 coats of epoxy primer then a top coat. It will never see a winter as long as I own it anyway..

 

 

That frame is definitely good to go. I live in the midwest and I've seen trucks with frames way worse that still hold up to towing and a loaded bed. That just looks like surface rust, it's not going to crack anytime soon.

 

THAT FRAME IS JUNK