Ive used the POR20 slver header paint too, used a brush and it lays out to look like it was sprayed. did some lower temp heat cycles to cure as per instructions. It looked awesome & held up for about 7-8 years but the car is stored outside in a dry lean-to shed off the back of my garage for winters so its exposed to lots of condensation as the temps get warmer in the spring, the engine & all metal parts will look like a ice cold soda or beer bottle in humid summer temps, so im sure that shortened its life quite a bit. heres a pic of what it looked like a few years after use.
I also mixed some POR manifold grey with the POR20 silver about 50/50 to make a silverish/grey color and used on the up/down pipes on my turbo 301, that looks like the day it was applied 10+ years ago with no signs of failure.
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