Not sure about the other reviews here
Frankly this was just a mistake.  It wasn't the cheapest and the top looks absolutely worse.  Really had high hopes here, I figured it's canvas, and it's a dye, how hard can it be.  Even after a thoroughly cleaning, drying and this products application, it really didn't do much of anything.  First off the 1lt is only enough for a single coat of a 4 seat BMW 325ci, and just barely.  Two coats could maybe correct some of the patchiness but I doubt it.  If you have a PERFECT top that is just a little faded, you may get the results you are looking for if you use 2lts and work quick.  However, it took any imperfection I have and made it stand out 3x as much, dyed-shmied. No disrespect to others hear but I would ask for a posted picture of a before and after.  As you can see from my pics, AFTER which you can identify as it still has VERY bright blue streaks drying, shows faults becoming eye popping noticeable.... .  The bright streaks will fade, but the bar lines and the other "spots" where the roof is dry, are there for good.
Rating: 2 stars