I've always liked and used the turtle wax ice products in the past. So since getting the slingshot that's all I've really used is their exterior/interior detailer to get off the occasional dirt and dust or after getting caught in the rain. Haven't really had it bad enough to need and do anything other than wipe it down by hand. Tried once to wash wash it with with soap and a water hose but it just seemed more time consuming and less productive than using the spray detailer.
I will say however before reading this thread I had no idea what F11 was. After much reading and research I'm right on the verge of getting some and trying it. Seems to be a lot out there of is it a scam or is it legit but those that like it seem to swear by it. I guess because of the price there doesn't seem to be a lot of people in the middle, they either love it or bash it. Slingshot is garaged and doesn't see a lot of bad weather so I guess if that bottle got me a few coats before it runs dry it may be worth a try.
I have Top Coat, bought a 16 oz kit to give it a try, It seems to work well and leaves a nice shine on my Slingshot. Having said that I recently joined the detailing 101 group on face book which is a group of people who mostly make a living detailing cars, trucks and aircraft. One of the first things I did after joining the group was to do a search to see if TopCoat had been discussed - I was surprised to find that there have been thousands of posts and threads about TopCoat and it seems to be universally considered to be crap. After I did that search I did another search for a product I was told was just as good as TopCoat but better priced, Lucas Slick Mist which is under $8 at Walmart, and there were just as many posts and threads about it and it seems to be universally loved.
As I said in my post above I dont consider TopCoat to be too expensive when you consider the cost per use, But considering what the professionals seem to think I decided to buy a bottle of Slick Mist and to compare them side by side on my slingshot
It wasnt a scientific test of any kind it was just a quick test of shine and the ability to shed water. I washed both front fenders with water and dish soap to be as sure as was reasonably possible without getting into too much work that I was starting with a clean surface I then polished the left front fender with TopCoat and the right fender with the Slick Mist when I was done I asked my wife to be the judge and to pick which had the best shine - after looking at both from different angles in the sun we both agreed that there was no difference that we could find - both looked great
After the visual test I got a spray bottle of water to test each fender to see which repelled water better. This time the difference was very noticeable with the Slick Mist doing a much better job with the water beading and running off.
Having used both products now I suspect that the TopCoat would be the longer lasting product, the film it leaves before I buff it seems to take more effort to shine up, but I am not really worried about either product lasting months because I like to polish up the Sling at least once a week and it is garaged at home and here in the desert our weather is mild and there is no road salt
So at this point I am not sure if I will continue using the TopCoat. Having talked to the members on the detailing group it seems very clear that none of them would use either of these products as the only protection they were using they would only use them as a final topping over a sealant/synthetic wax.
As such I think when the TopCoat runs out I am going to do the entire sling with Meguires Ultimate paste wax and then use the Slick Mist - - one thing nice about this at $8 I can use the Sick Mist much more often and generously
also just to be clear - I could easily change my mind in the future and either go back to the TopCoat or change to something completely different - I just want my Sling to look good and I am not married to any particular product