80 dodge aspen

Yeah, sounds cool I kinda like the disco era Mopars. One of my buddys older brothers had a R\T that was like a 79-80 it was one of the first cool cars I got to drive. Check out year one for floor boards or If you can get some gauge metal you can do the patching with that. To do a good job you have to cut the rust out you can't really just glass it over or bond it. If there are only pinholes however you can take a wire wheel on a grinder get it down to bare metal then use the reinforced fiberglass filler for a patch. It'll get you going for inspection and be good enough until you get more skills with bodywork.
500$ is a deal for any car that runs ans like you said if you fu^% it up it aint like you wrecked a Chally or somethin.
Welcome! :headbang: