Bf Goodrich brown walls

Bob's Barracuda said
I bought Bf Goodrich Radial TA's to go on the Keystone Klassics on my 68 Barracuda (yeah no school like the old school) anyway no matter what I try I can't keep the letters white. I can GET them white with lacquer thinner but it seems to draw the oil out of the tires and within a couple days they are brown again. Any ideas?

I agree with the old school look.
I’ve read a lot about the problems also and decided to go this route. White letters on the inside.