I did see that in the video Adam mentions it will be a little tacky, if you cannot see the rainbow effect, and as I mentioned above, I did not notice any sticky or tacky feel to the surface treated.
Ok, since my comments above didn't seem to get this across, let's spell it out simply:
1.) Printed instructions shown both online and in attachment sent with product stating time of "15 - 30 seconds".
2.) They also both stress clearly NOT to allow it to dry.
3.) Mention that it will be a little tacky has to be weighed up with that fact that at 30 seconds time, I am at the top end of the instructed wait time, and makes one start to wonder how much longer to wait and risk it drying.
4.) if 30 seconds is not sufficient time, it should never be listed as the top end of the flashing time.
5.) If the actual suggested time stated verbally in a video is "20 seconds to 1 minute"", this opens up the top end of the range to twice as much expected wait time.
6.) More and more here, I get the sinking feeling that I may have to redo this process on my wheels and double the instructed wait time.