Flex Coat Color Preserver - $1.94

This strong color-preserving coating penetrates the fibers of your wrapping threads for excellent color retention. The non-toxic formula resists yellowing, so your favorite rod doesn't look like an antique while it's still in its prime. Apply two or three coats on regular thread and only one coat on N.C.P. thread if you want an extra layer of sealant. Comes in a 4-ounce bottle. - $1.94