POR15 is amazing stuff. Here is some testing I did with chemicals. I did my own testing before I did it on my tanks. Also have 3 tanks done this way holding up perfectly and clear as can be. POR15 is moister cured so works best on rainy days. The stuff is so non porus that ever paint stripper can get into it.
When you see this stuff at car shows. The salesman will have a plate of steel and a screwdriver. He will ask you to try to even scratch it. Rock crawlers will tell you it's the only thing that holds up to bashing on rocks. As far as paint it amazes me all the time. It needs to be done right and on rust though. It does not like new shinny steel. It needs rust for that por15 bond. I let all my fl250 I painted rust for a week then started the por15 process. They say you can paint new shinny steel but I have always been able to chip it like paint. On rust it rock solid even beating on it. They also paint chemical holding tanks with this stuff.
I posted a pic below. I like to use the threaded rod. My thinking is the threaded rod has lots of surface area. Plus it is just easy as pie. If using coat hanger make sure it does not have some funky coating on it. So I just use rod. BUT you can use anything really. You need to clean and change the water everyday as well. Also scrape all the crude off the rod daily. You do not need to get fancy with coat hanger and cookie tin. Anything will work. I even used and old chain. As long as it's steel it will work.
DO NOT GET ANY OF IT ON YOU. IT TAKES WEEKS TO COME OFF!!!!
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