Forget about OptiCoat or CQuartz....if you want to DIY the 'idiot proof' way is 22ple VX1 Signature Glass Coat (Unless you can get hold of OptiCoat Pro or CQuartz Fines)....MUAHAHAHAHA.....    

At your service sir
(22PLE, just in case haha)

Thanks sifu, i will go for 125ae then.
Not dare to spend 1k for those powerful rotary that i could not fully utilize it as I currently living in a condo. I planned to do those detailing stuff when i bring my gf balik kampung once every 2 months(landed property).

Detailing at my condo is really tough. Not enuf lighting, cramped parking lot, almost non-existence car wash bay beside garbage collection and no elec outlet nearby.