I am sorry to hear that your track is chipping. We recently purchased something similar, but for an external mainsail
track. Ours is made of high molecular weight poly, which is supposed to be UV stable. I cannot remember the maker, but I ordered it through our sailmaker
. Omar Sailmakers in Beaufort
can help you if you call them. Also, I would think a search would bring something up. Be prepared for a pricey estimate; the track I got was $18 a foot. All I can say is thank goodness for low aspect ratio masts.
Good luck with your search!