Done the bay on my glanza luminous/pearl candy pink and i think it looks immense. i've also dont the bay on my GT advance in the standard 205 black but mega regret not doing it a bright colour. nice surprise when you pop the bonnet! Do enjoy spraying engine bays, but you will always get some area that reacts/doesn't go quite right due to the nature of having oily/coolant residue. I didn't do much prep at all in either bay and they both came out reasonable. the battery tray on the glanza wouldn't play ball no matter what i did but at the end of the day the battery will cover it!