i thought that might confuse you. the door handle i can make flat(using a power sander and block) but if you can find a picture of a 92 accord , look at the plastic trim on the doors. imagine taking that off, now you have a section in the door, fill that in. but when you fill that in sand , there is about 6 inches above that line that dips in (running your hand top to bottom) the sander i use is about 4 square inches. should i use a different tool to get a larger area even {note: the door itself is curved , its not flat} find a piture and it might be easier to understand.

for that door handle i used fiberglass bondo, some green shit. It workes well and has not cracked on me, the shit is strong as hell.