about meguiars squirl-x..
can it be used a a light polish for cars?

follow by NXT Tech wax for maximum protection?
if u stop at Swirlx,like halfway only. 

by the way,applying swirlx by hand or polisher got huge difference? or we just cant go any further with consumer range products?

Yea swirlX can be applied by hand. My friend is using by hand which gives favorable results.

ultimate compound more towards minor oxidation n some swirls mayb?
its a little bit more aggressive than swirlx/scratchx i guess..

No worries if Swirls X - but after every panel or two pld detach & flush with water
& then stick it back & spin dry in a bucket

The success key is - u must alwasy have a clean & un contaminated pads when buffing
no worry for the cheap but the harshness & body structure should be well consider prior using  - otherwise u get more damaged than good
Some times less is more

techniques & working on with products also into considerations