As far as the krylon eating the paint, not sure why it would do that but I used the same stuff and it seems alright. However after looking, the newer paint appears to have "plastic fusion" so im assuming it's more plastic safe. I wish i'd known about the new stuff before I did it but oh well. I wonder if there is some kind of like bondo for plastic you could use to fill it in and paint over.
"Hokey religions and ancient weapons are no match for a good blaster at your side" - Han Solo
Commanding in Airsoft