I have did the sierraglow already. took like 6-7 hours.
the guy is friendly and drop me back to my office at sunway though.
once done you'll feel the car is laminated lol.
rainwater will bead up. i feel good loool.
anyway the shine remains now prior to sg-ing it.
as my car is white it is better maintained now with the SG.
my car used to be very dirty.

dependent on the size of pebble. if its big enough it can make a peck, else small one the SG will deflect it without much damage to the car. the SG is like a layer of lamination. Just like you laminate your school textbook. The laminate is about 5 micron or something, he mentioned it is as thick as the cigarette plastic wrapper. and nope they dont warrant damage from rocks. how could they lol???
just dont drive behind a lorry or you may want to overtake it.
i always slow down further away or overtake lorries.

for a white car it is worth it. cause whities always get dirtied. not sure bout other colors.