Thanks for your replies!
I have downloaded the Curls on the go app, so I'm going to experiment with that. I'll take a look at the Gliss Kur conditioner as well, didn't know that there was a conditioner of Gliss Kur without tons of silicones, so that's great news

I won't go to the UK/London very soon, but I'll keep it in mind, it sounds great!
I know that there are silicones in the curl booster spray, but my question was more about the fact that I did get more curls from it (duh), but I found it so strange that I didn't get the same curling results with this method.
And I had already heard about the selfmade gelthinghy, am really going to try that out. Does it work as a gel and curl booster at the same time?

Again, thanks!