UV rated spray for convertiable top
 

Hi, I used the spary (scotch gard) to spary my top once when I got my car, that was about 8 months ago, thinking about respary it again, someone told me to get the UV protected type of spray like something call rattop ???
Want to find out if UV protection type of spray is necessary, please advise on what to get, where to buy. Thanks.
Tin