Some years back I was in the boat rental business in Florida. Some of my boats that were less than one year old began to show cracks in the vinyl seats. The manufacturer sent a rep out to verify the warranty claim. He took one look and asked me if I was using Armor All on the seats. I told him yes. He told me to stop using it as it damages the vinyl. He suggested STP Son-of-a-Gun. There are a lot of alternatives since those days.