Strangeness and POR-15

[318 Six Pack]

Still working on de-rusting and rustproofing the roof of the '72 Charger and came across something completely unexpected. After a series of Jasco de-ruster applications (phosphoric acid based) the POR areas that got several applications of Jasco started lifting and bubbling. Now they have dried out and are flaky. Really odd. I'll be knocking all of the affected areas off with some sandpaper before applying cold galvanizing paint.

As far as I can tell, the areas that were just wiped over once or twice with Jasco are not visibly affected.

Hope to get the raw video wrapped up tomorrow and have it edited, narrated, and posted soon.

 

[flypaper]

its not odd when you are mixing different chemicals like that together.lol
something is not compatable between the 2 and it is starting a reaction.
that is why you should stick to just one product line.
the derusting chemical should be used on bare metal
before covering the metal up with por...

 

[318 Six Pack]

its not odd when you are mixing different chemicals like that together.lol
something is not compatable between the 2 and it is starting a reaction.
that is why you should stick to just one product line.
the derusting chemical should be used on bare metal
before covering the metal up with por...

What is left of the POR has been on there for 7 years. Various tarps and covers have rubbed the area to mostly bare metal.

 

[flypaper]

you need to remove the rest of the por before you even start.
imo
por is a just waste of your money and its also nasty stuff.
it doesn't stop rust,it just covers it over.
get rid of it all.
get your parts completely to bare metal,(wirewheel or blast or paint stripper)
then hit with rust treatment,
then epoxy prime is the way to go to tackle your rust.
you can just go panel to panel so you do not get far ahead of yourself.

 

[318 Six Pack]

"you need to remove the rest of the por before you even start."

Yea, that is what the sandpaper part from my first post is all about.

"por is a just waste of your money and its also nasty stuff.
get rid of it all."

No, it is great stuff and still working great where it was not mechanically rubbed away where the vinyl top will eventually go.

The rest of the car was primed when I applied the POR, still have not painted it and other than places where the cover rubbed through, or I did by sanding, it still looks good. Will have to scuff everything, prime and block before I go to paint this time.

 

[flypaper]

to each his own
if you properly remove all the rust and epoxy prime the metal
will work good enough.
por 15 will not be any improvement from that.
now as you have found out,
certian chemicals will react funny to this great por 15 stuff.
so now you have that problem to worry about.

 

[eric383]

I had the same thing happen to a Eastwood rust encapsulater. I cleaned off the rust encapsulater and sprayed it with epoxy primer and all was good. I'm guessing it doesn't like the rust converter.