Thoughts on POR-15 Metal Prep before Epoxy

[Kemo]

all,

what are your thoughts on the POR-15 Metal Prep product? i am working on a 914 and was using POR-15 paint in some areas and was using the POR-15 metal prep. i was pretty impressed with the way it left some of the bare metal. it left a grayish color that didnt flash rust right away. Also, i didnt let it dry out like Ospho and there was no funky mess or ashy powder.

in any event, i think its laying down a zinc phosphate layer...probably pretty thin, but enough to give a limited amount of flash rust protection until you can get some epoxy on there.

anybody use this product for regular paint? seems like a better alternative to Ospho IMHO.

[aaron144]

I've used it and then the Eastwood 2k epoxy from the Aerospray can. It worked well. Yes, the metal prep etches the metal and leaves a coat of zinc phosphate.

[E Sully]

I've used POR15 Metal Prep which worked well, and later switched to Picklex.
The Picklex seems expensive at first, but goes a long way.
I first read about it on this forum. Pelican Parts Forums - Search Results

[FA-18C]

Also consider Mastercoat

[ChrisHamilton]

POR-15 is a gimmick product. Pro's don't use it. Any moisture cure urethene is not what you want to use in automotive restoration. The modern and best way to stop rust is to first remove it with any of a number of ways (dipping, media blast, Ospho or other Phos acid treatments then neutralize) then use a quality (hint not Eastwood DIY garbage) 2 part epoxy primer.

Here's a little thread on what happens to metal that has been treated with POR-15. A good discussion with a lot of Professionals in this thread. You don't have to be a member to view the thread or the pictures.

why you never use POR-15 EVER!!!! | Southern Polyurethanes Forum

[ChrisHamilton]

Why is POR-15 so frowned upon? | Southern Polyurethanes Forum

Noobie here: Help me replace POR15 in my arsenal | Southern Polyurethanes Forum

POR 15 Question | Southern Polyurethanes Forum

http://www.spiuserforum.com/index.php?threads/spi-epoxy-primer-over-po-15.5591/

[962porsche]

I do not like any of the por products ! if you have rust you simply remove it as Chris stated!
trying to convert it just is a half assed way to deal with it.
as for stripping metal down to bare we have only used the glasurit metal cleaner pre products.
you get a good quality epoxy primer over the bare metal ASAP .
if we can't get a primer over the bare with in at the most a few hours ofter it's stripped we tend not to strip more than we can to in that window.

Porsche owners are always worried about the galvanized coating on the cars.
this strikes me funny! Porsche was one of the 1st auto makers doing it but shortly after every auto marker started doing the same thing to the point everyone was doing it.
the galvanized coating is more for under panels and seams than the outer body panels. the outer panels you can get the same protection from a quality primer.
if your doing a patch panel you use a chromated or zinc based primer on the back side and where the welds are.