por 15 question, is it a paint, or meant to be painted over?

[TRQJNKY]

alright, im going to por 15 my frame on my chevelle, since everyone says its the best stuff ever. now is it just por15 and done, or is por15 meant to be a primer and painted over?

 

[BondoSpecial]

POR 15's website wants you to buy a topcoat for it rather than treat Por15 as a topcoat itself. I have never ventured into Por15 territory because if you buy their prep, the por 15 itself, and then any tie coats and topcoats it ends up costing a ton. It might be worth it for all that stuff, I can't tell you. I had to strip some parts off a rear once where the previous owner went POR 15 crazy and painted the wheel hub flanges, wheel studs and everything. I can tell you this, the por 15 was rediculously hard to remove (that's a good thing)

 

[POS71RS]

alright, im going to por 15 my frame on my chevelle, since everyone says its the best stuff ever. now is it just por15 and done, or is por15 meant to be a primer and painted over?

I don't know that it's the best ever. I figure there's gotta be more modern formulas these days, but POR is the only of it's kind I have experience using, so I continue to use it.
I've found that it either sticks on like crazy, or peels off in sheets.

In fact, just last week I saw some POR bubbling off my upper A-arm. I poked at it, and it came off in a big ol sheet. I wasn't thrilled about that, but nonetheless, the metal was still unrusted below!

I would blame my lack of materials, prep stuff, etc when I did the A-arms... about 15 years ago.

POR is not easy to paint over. It's meant to be a topcoat for the most part. In fact, POR recommends spraying a light coat of primer over POR while it's still flashing; to give the paint some tooth/ bite into. Otherwise, the POR is difficult to sand (and therefore give some tooth for the paint to hang onto) and the POR is too smooth for paint to hold to.

P.S., POR's base black is not UV resistant. It will turn chalky over time if exposed to direct sunlight. For my frames, I used their base black (for protection) and topcoated that with the UV resistant gloss black just after the base POR flashed.

 

[qn60e6]

What about Rust Bullet?

 

[TRQJNKY]

never heard of it

 

[krabben1]

POR's extremely tough when cured.If you need to topcoat it,I would use theyre stuff.Ive seen stuff stick to it that I didnt want,and some stuff not.I know it doesnt like to stick to etch primers and smooth shiny metal.

 

[volsfan]

No need to topcoat it if it will never see sunlight. As mentioned above it will turn chalky when exposed to direct sunlight.

 

[kawboy]

If your going to put it on your frame I would suggest using POR15 Chassis Paint. The best way to do it is first use the standard POR15 then topcoat with POR15 Chassis Paint but it all depends on what condition the frame is in. For the guys that don't know, the Chassis Paint is UV stable and will not chalk or turn white.

 

[red78z]

would you be able to use it under paint for the rockers, rear quarters ,fenders,etc...?

 

[earlysecond]

First I will expose my bias. . .I am not a fan, at least not anymore. I am, however, a big fan of epoxy primer and some high quality, black will leave a nice and durable finsih.

Pait over rust products are well marketed. I am not saying they are worthless, I am saying that I will never again pay for them. This has to be your choice. Moisture cured urethane was invented previous to WWII this is not new technology nor is it fool-proof or a forever fix. These type of companies got $300 out of me over the years but that has ended.

Get some other opinions before hopping on the POR train.