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Seems like every header I saw that was coated, was just stupid crazy priced over a non coated one.
This product can be applied to a header as well. If done right there's a fair amount of time involved in coating a header. Trying to get into the collector where the tubes are welded together can be a biatch.
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i had a can of VHT aerosol ceramic.... expensive($8/can)
This is better quality than VHT. It also costs $32 for an 8 ounce bottle. Aerosol not included.
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it really didn't do much at all, other than eventually just flaking off. it even allowed rust underneath it on a turbo housing that has yet to be used.
The key to using this is proper prep work. Complete blasting or acid etching, thorough degreasing, proper application with spray gun. Like paint, poor prep = poor results.
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i'd be interested in seeing what this stuff would do internally as well.... like runner ports and stuff. might keep carbon and oil off of the walls from the PCV and EGR systems?
Won't keep wither component off the walls of chambers and ports, but it does take longer for carbon to accumulate and it was easier to remove. Oil is extremely hard to control once it's in a vapor. I've seen an engine with too much TBC applied internally. The oil was always dirty because it never got warm enough.
Look for techline coatings. There used to be a good article on thermal barrier coatings.