I had my calais ceramic coated with Opti Coat from brand new 5 years ago. The car is black and got a lot of swirl marks from using a car wash cafe for a couple of years. the car is about to go into semi retirement and live in the garage, coming out for the occasional Sunday drive. I had the car paint corrected, as I was going to sell, but haven’t had a coating put on beyond the wax they used. I am thinking of just using a sealant this time as I will hand wash, and it won’t be used as a daily. Are the self application ceramics any good, or useless for beginners like me? Was thinking of maybe putting some on my SRT too, but it uses the same car wash cafe now..... thoughts?