I used flex seal, the brush/roll on one, I used two coats of white then two coats of black and two coats of white, the first two coats is because I wanted white on the inside, the two coats of black is to block the light then the last two coats of white is to reflect the light, it makes a big difference, and hopefully it will protect it from getting brittle. I did a light sand job on it first.
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