Rather than starting a new thread (wtf is the new name, Kev?!?);
https://www.infinitywax.com/products/synergy-lite
This looks interesting.
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I used some of that just the other day. Really easy to apply. Literally wipe on, wipe off. Spreads nicely, once the applicator is primed you really dont need much.
It does say that you can leave it up to 15 mins but i wouldn't recommend it. 5 mins would be my max as it does become a bit grabby if left too long. Needs a buff with a shorter pile cloth first to remove the excess, then use a plusher one to wipe over once you've done all your panels just in case of any streaks. It does have pretty good filling abilities too which is noticeable, especially on gloss black pillars.
Im going back to clean that car soon so i will check up on its performance after about 2 weeks.
Only thing i can see being an issues is the spray heads, i tried to empty them out but im sure they will still clog up eventually.