It depends on waht's causing it. If it is being discolored from growth on top of the gel coat, FSR or better yet May Kate's "On and #^&#^&#^&#^& will bring it back. If its being discolored from the UV rays of the sun, nothing is going to bring it back sort of New Gel coat. or a vigorus application of compound. Try the On and off and see if it works, if it doesn't learn to live with it or compound it away.
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