wilbur

Just recently purchased a can of chassis coat black (aerosol) by por 15.
Painted a few small parts and was very impressed. The paint is very durable and has a very nice satin finish.

I'm almost ready to start painting the engine compartment on my 58, Im using SEM for the firewall and inner fender and Por 15 for the frame with a top coat of the chassis coat black but I started thinking do I really need the Por15 as a base? I have no rust issues and the chassis coat black is very durable?

Nowhere Man

If the POR15 is any thing like I used I would throw it away

Zoomin

POR15 is a rust converter, so if you don't have any to convert I wouldn't bother. You should use a primer of some sort though.

C2Racer

Sorry guys but have a lot of experience with POR-15 and it is not a rust converter. It is a neutralized rust encapsulater. The key being that you need to remove as much rust as you can and then phosphate wash the metal to neutralize it first and then apply the POR-15. Now to the OP's question I would not use POR-15 as a base for further painting as that is not what it is for. A self etching primer is the correct coating if you do not have rust issues once the metal is exposed. POR-15 will encapsulate old paint pretty well but the surface needs to be sanded well to make it look good.

oldgold49er

I agree with racer. I inquired before buying POR15, because this discussion has come up before. It was recommended to use a phosphate wash as soon after exposing bare metal like sandblasting. After cleaning the frame with reducer and waiting for an hour in the 90deg. sunlight, I sprayed the phosphate on the frame, I could see the chemical reaction in the metal it turned whitish very thin as it dried. Let it cook for another hour in the sun. I then covered the frame with the POR15, there are lots of nooks and crannies in the frame. Best to have good light and 2 coats is better than 1(also recommended). The next day I applied a 2nd coat after letting it heat up. Being black, this time it got hotter. I then sprayed the frame with Eastwood extreme chassis black. I had heard that POR15 fades in sunlight. Happy to report still looks like the day I did it. Has some dust.

wilbur

The part I painted yesterday with the aerosol por 15 chassis coat dried rock hard.
I tried to scratch it off with my finger, no way! Perrsonally I think this paint is great.
I'll pick up some por15 self etching primer for my frame.
Thanks !

DansYellow66

I'm not familar wih POR15 chassis black - is this differernt from their standard gloss and semi-flat black? Their standard black products do fade and weather over time if not top-coated. I wonder what they say about the chassis black?

But - all things being equal I think I would use the Eastwood Chassis Black instead.

wilbur

Their chassis coat black is a top coat and says it will not fade with exposure to the sun.