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-   -   Painting over rust conversion coatings (http://www.hotrodders.com/forum/painting-over-rust-conversion-coatings-229060.html)

mitmaks 02-01-2013 01:45 PM

Painting over rust conversion coatings
 
Does anyone use Rust Mort, POR15, etc. and how did you paint over it. Epoxy primer and then paint?

mr4speed 02-01-2013 05:14 PM

I shot a set of inner wheel wells for a pick up a while back that were done in por 15. Just a red scotch brite, give it some bite with that then some black epoxy then some satin black s/s. This was just to give it more rust protection, not really high end work. To be honest not too crazy about the por 15.

Lizer 02-01-2013 07:36 PM

I scuff with red scotch brite until there is no gloss left, and then epoxy.

milo 02-01-2013 08:23 PM

I use Sem's Rustmort there are 2 kinds one needs to be coated (69508) the other can just be left uncoated. . let dry a day or so then sand with 180 and prime with your choice..

deadbodyman 02-03-2013 08:24 AM

I used to use rust mort but I found Ospho works much better..You have to be very careful when using acid products...Theres a whole proceedure I use but all I know is how to prep using Ospho...first off you want to remove the rust not just convert it,thats tuff enough...I always sand everything completely with 180 to get off any excess build up from not wiping enough off when done...after that I scuff with a red pad then clean with W&G then I get out the tack rag and give it a good final cleaning...I always use epoxy primer ,I prefer SPI epoxy for high quality and low price...
If you want to know more about how to use Ospho for removing rust, start to finish I'd be glad to help but just remember be very cautious using acid and be very throuogh with your prep because they are the #1 cause for paint failure, usually bubbles...so do your homework and know what to do before you start and you wont have any trouble later on...

Alpha67 02-08-2013 05:52 AM

I strongly suggest testing your POR adhesion before you do anything if you painted it on anything that wasn't rusty, rough or sandblasted. I had a massive failure with a comparable product where it blew off in sheets when I hit an exposed an edge with compressed air. I'll never use that stuff on anything other than rusty or sandblasted. Think of POR as "Paint Over Rust"

mitmaks 02-08-2013 01:38 PM

Quote:

Originally Posted by Alpha67 (Post 1643964)
I strongly suggest testing your POR adhesion before you do anything if you painted it on anything that wasn't rusty, rough or sandblasted. I had a massive failure with a comparable product where it blew off in sheets when I hit an exposed an edge with compressed air. I'll never use that stuff on anything other than rusty or sandblasted. Think of POR as "Paint Over Rust"

Thanks for pointing this out. I do follow directions and I had good experience with POR15. Why? Cause I followed directions and used it over rusted metal and it has held up fine for 10+ years now. There's a few people including on here who blame the product but when you ask them if they used it over rusty metal they will answer "no, do I have to?"

Alpha67 02-09-2013 07:45 AM

Quote:

Originally Posted by mitmaks (Post 1644089)
Thanks for pointing this out. I do follow directions and I had good experience with POR15. Why? Cause I followed directions and used it over rusted metal and it has held up fine for 10+ years now. There's a few people including on here who blame the product but when you ask them if they used it over rusty metal they will answer "no, do I have to?"

Actually, I followed the instructions to a T. I used DOM16 which is supposed to be equal to POR15. After the coating failed, my complaint to a company official netted me a response that he felt this product was misrepresented by its label which claimed the product could be used on clean, bare metal and previously painted surfaces. He admitted that this product was developed specifically for use on rusty or sandblasted surfaces.


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