
Hmm… proper eye and respiratory protection. ;)
Sealants and residue from dremel usage/sanding can wreak havoc on your lungs and your eyes, and absolutely no project is worth that risk.
Also it doesn’t make much of a manly war story if you say you lost your eye to a Monster High doll.
(“I tell ya’ man, there was like six of them, all headless, that plastic just came right at me, man.”)