The Stovebolt Site Forums The Shop Area Paint and Body Shop POR-15 question

Hi all,
I'm not actually a Chev or GM guy but I'm working on an old truck (a '49 Willys 1-ton) and love the site, I go here a few times a week and read-up on a lot of general info (stuff that doesn't just apply to GM).

Anyways, my question is this:
Can you apply POR-15 on top of an Epoxy primer?? My welding guy is painting my frame with Grey Epoxy primer as used in construction and I'm thinking about using my POR-15 over this...otherwise I'm familiar with the POR application and have the metal ready stuff, just never heard of this before (wondering if it's a waste of precious, precious POR).

I had assumed I would pick up a rusty frame with a welded section but he is kind enough to paint it for me. I had originally intended to wire-brush, pressure-wash and dry the frame completely, use the metal ready and put a couple coats on top. But now I'm wondering if I just need Tremclad or Rustoleum etc.

Anybody done this before? If so, any advice on the prep?

Thanks a lot for helping out this newb!! I'm 16 and this is my first vehicle, learning as I go.
I think my main dilemma is whether to sand or use the MetalReady prep...don't know what will happen either way.

Kier

PS: I did my best to search for this situation, but didn't spend much more than half an hour of digging 'cause I really need to know what to do right away (I've gotta get my frame tomorrow, storing it outside, supposed to rain the day after tomorrow, I never leave primer out in the rain. So basically this will all be happening tomorrow afternoon. So please accept my classic, Canadian "SORRY" for the rush)

Kier,

Epoxy primer will seal the metal - a little rain will not get through to the metal (if the epoxy was properly applied).

The metal should be rust-free before applying the epoxy.

POR (Paint Over Rust) is costly over-kill when applied over epoxy. MetalReady Prep is for non-painted metal.

Preferred sequence: POR over rusted (Prepped) metal and then epoxy over the POR before it has set. The epoxy then gives a good surface for over coatings.

Ok, I'll see what's up -- I'm pretty sure he's doing the whole frame, but possibly just the welded areas, as I know he's not going to sandblast it, which would really be the only practical way to completely remove the rust. Either way this guy knows metal so I'm not worried about how he's going to do it, I'm sure he'll do what's best.

Perhaps if he's just doing the new metal that's been welded in (which is a pretty substantial area), I'll topcoat the epoxy primer with a normal rust paint and do the rest of the (rusty) frame with metal ready and POR. Should do the trick just fine.

That's good to know the epoxy primer won't rust -- I don't know my paints too well, I just know what I've used before is worthless if you don't topcoat it. How durable is Epoxy primer?

Thanks a lot for clearing this up!!

Kier

16 years old and scratch building a 49 Willys 1 ton. How cool is that? Glad to see young guys enjoying old trucks! The guys on this forum are a great source. I see your from a great part of Canada. Good luck with your truck Kier

As I understand it POR 15 needs metal contact to be effective. My body man tells me its either epoxy or POR 15 but not both. I suggest putting the question to the POE 15 Help Line.

POR 15 has to used on either bare metal or rusted metal, rough surfaces preferred. If there's any prior finish on the part, it will not stick.

Use the Por and just follow their instructions.. you should be fine w/o the epoxy..that's what I did.

Hank

I would have to agree with Andrew. POR15 will flake off if it doesn't have a rough bare metal surface to adhere to or a proper primer. Call their hotline and ask that's the best thing to do.

I've used the POR 15 on most of my inner panels over a sand blasted finish and it sticks great. I read on the can that if you want to paint over the por 15 you should spray a thin coat of primer over the por15 when it gets tacky. I would recomend painting it directly on the metal. One of the great things about the por15 is that it can bend with the metal. I would think the primer under the por would chip if it flexed or if you hit it by axident.

The POR 'Metal Ready', definately seems to help as well.