Por 15 exhaust and intake paint longevity (1 Viewer)
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After about 60 views to this post and no replies I decided to try the POR 15 high heat manifold paint and report the outcome as time goes by. Maybe it will help somebody decide what they want to do.
Before I had both manifolds sand blasted I had to repair two threaded holes on the intake and work on the exhaust manifold where I had a crack where the stud threads into the manifold. Only time will tell if the repairs work.
I followed the instructions to the letter that came with the paint. Two light coats and wait at least 24 hours between coats. After that I took them to the powder coater that I use and he baked them at 300F for thirty minutes.
Ken
Before I had both manifolds sand blasted I had to repair two threaded holes on the intake and work on the exhaust manifold where I had a crack where the stud threads into the manifold. Only time will tell if the repairs work.
I followed the instructions to the letter that came with the paint. Two light coats and wait at least 24 hours between coats. After that I took them to the powder coater that I use and he baked them at 300F for thirty minutes.
Ken
sure looks good now. interested to see what the exhaust looks like after some run time.
I have used POR15 exhaust and manifold paint a few times. Most recently on my FJ80. I sandblasted the manifold first and then brushed on the POR15. After about 6 months some surface rust started to come back I assumed I did not use enough coats. I had my manifolds off again and this time used 5 coats. Now after a year I still have some surface rust showing up in some spots. Overall they look good,much better than they did before.
EDIT: I went out and looked at my manifolds and there are some "pinholes" of surface rust here and there. Nothing major. I think the POR15 is so thick that it does not like to flow into all of the nooks and crannies of a porous surface like a cast manifold. I remember now that after each coat I would look carefully after they were dry and would see some spots that it looked like I missed, that's why I used 5 coats.
EDIT: I went out and looked at my manifolds and there are some "pinholes" of surface rust here and there. Nothing major. I think the POR15 is so thick that it does not like to flow into all of the nooks and crannies of a porous surface like a cast manifold. I remember now that after each coat I would look carefully after they were dry and would see some spots that it looked like I missed, that's why I used 5 coats.
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Anyone else use this product on their intake/exhaust manifolds? Long term viability?
I’m not sure there are any paints out there that can handle the constant high heat/cool off transitions that occur on an exhaust manifold on a long term basis. Ceramic coating is probably a better option.
