etch isnt something to play...and dont ever put it in a uni...i did and it worked for a little bit, i open it an hour later an the shit exploded OD, all over my hands, face, pants room, everyting, i would only rock tha shit in a mop, like something not meant for graff but works anyway, and make sure you dont have something that will leak at ALL. i got it on my leg and didnt realize for liek an hour until it started eating my leg...it hurt for ever
but if you ever get etch on your skin then wash immedaitly with a lot of soap and water it helps alot