Mine is the same way. I am going to try a "fiberglass bathtub" refinishing kit I bought at Home Depot. Kit basically recoats with a layer of fiber glass resin. I used the same stuff on my bath tub when I remodeled the bathroom. I figure it will work my shell since they are both fiberglass. Kits only come in white and almond. Since my shell is white, it should work. It will be a gloss finsh instead of a flat finsh. But I figure the gloss finsh will help shed dirt better.