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In the past we used Floquil Tie Brown to paint flex track. As we know, this is no longer available but Rust-Oleum just introduced a roof accessory paint called Weathered Wood. It is a perfect match for tie brown, its low cost ($4.77 at one Home Depot, comes in 12 oz size, sticks to flex track and has a fine pigment so does not hide detail.
If anyone has tried this please leave a comment with thoughts on your experience with it.
Update
I've been told that this paint is no longer available. I disagree. Home Depot has it and if they have it, it's probably at other retailers.
https://www.homedepot.com/p/Rust-Oleum-Stops-Rust-12-oz-Weathered-Wood-Roof-Accessory-Spray-Paint-285217/205717533
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