Well the major rust spot to look out for are around the front suspension towers,under the passenger and drivers mirrors,on the inside of the doors along the bottom edge,in and around the fuel neck/filler and around the boot seal. I also like to stick my head underneath the car to see if it has any major scrapes on the under the body or crash damage ie clamp marks on the seal panels,bent front reo ,creases in the skirts. Also lift the spair wheel cover up have a look at the beaver panel make sure the sealer looks original or it could also be a sign of crash damage. 1 last thing have a look inside the engine (take of the oil cap) and see if its clean or really black and dirty this will give u an indicator if the engin has been serviced regally or not also checking the dip stick for oil burn does the same sort of thing good luck with the Purchase