I've used the Mequires's tire protectant. It does last long and does not turn brown. It is a gel like product that comes with a special curved aplicator. It works pretty well except it tends to collect in any lettering or grooves or depressions on the tire. I still prefer the Armorall, just spray a little on a rag and wipe it off.
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fordgasm
CLICK HERE to see my 87 GT