White Letter Tires Turning Brown. Sand away the yellowed layer slowly and gently until a bright white layer emerges underneath. When first put on the letters looked great, but after a short while there is a browning to the upper part of the white letters.
Make sure the brush isn’t too harsh, as it may scratch the tire. The mid sidewall area of a white sidewall or white letter tire has a thin protective strip of rubber over it that is buffed away to expose the white compound. All stains are gone jun 2nd.
By shayes in forum detailing 101 replies:
Apply the cleaner and leave it for a couple of minutes or as specified in the manual for the cleaner. By detail n00b in forum detailing 101 replies: We have these laying around at work and they look like a giant white crayon. In addition, some tires are more prone to premature browning than others.