i outline shit with rusto fats ALL the time, if you work fast enough you can get a decently thin line. but i like a fat outline for bombs and throwies
im not sure if it works with black deaths but on average stocks, if you take out the insert they spray thinner. just drill into it with a sharkp screw and pull it out.
for a piece i dont recommend using rusto you dont have that many options with caps and its not that high quality paint. if you really want to have a clean piece i would use montana black, its high pressure so it will give you way more control over your lines. but if you've never used high pressure before you could fuck it up completely it takes a while to get used to.