My LineX bedliner faded after normal use and wear after about 5 years…only found one product online mainly for “touch ups” to bedliners and that was “Rhino Shine Ultra - Black”…
My bedliner is LineX but I used one coat of the Rhino Shine Ultra and it’s looking brand new again…took me about one hour for the whole bed and dried pretty quickly (under an hr)..a regular paint brush is all you need..hope this works for you!