i find spray paint from car product shops like supercheap auto and autobarn generally thin, cheap and spray uneven. thin paint is bad because you need to put on more coats. if you are not careful and rush then drips are more likely to happen. for the best spray paint in melbourne with competitive prices go to shop 29, swan street in richmond (right at richmond train station). this shop just opened! they have in stock many colours and this spray paint is imported from germany! ask the staff for special nozzles, never use stock nozzles! i think you remove the engine cover by the screws/bolts on the top. good luck!