i made this tutorial for bombingscience.. might as well post it here too...

1= Get a regular cover off any krylon rusto etc.

2= you want the center part. Begin to cut off the excess plastic

3= Once you have center part by its self, its time to cut enough off to fit your finger in. i find using a bench grinder works fast. if you dont have access to a grinder, use an exacto. be carefull though the plastic cracks easy.

4= After you made the space for your finger, get a needle, thumb tack, pin etc. and heat it up with a lighter till it gets red hot. Then make a hole in the middle. Dont make the hole too high or too low ,if you do no paint will go through.

5= Put it ontop of the can to make sure it fits good, if you grinded (cut) too much from the center part the cap will fit too lose and not stay on.

6= When using the stencil/thin cap make sure to tilt the can upside down and flick the paint out, due to the small about of paint exiting the hole it
will build up in the can and leak out and that will make a fucking mess and/or
paint will spill onto your piece.

7= As you can see, you can get Really thin lines (i didnt shake the can up
enough so the paint isnt opaque as it would normally be but you get the point)

-Hepos