Sigh, but the wierd thing is that it looked solid red to me all over the whole body

I did spray light mist but somehow it ended up too thick thanks to my itchy hand

I left it about 10 mins in between each coat.
I've only got a grey tamiya primer which i never use because i've no idea how to wash it off and i'm afraid to use it on my airbrush because i didn't know how to clean the airbrush after that. Please guide me
Also i didn't know how to strip the paint off for now or do i have to get another new kit?

Do i sand it off?
Sigh, this is supposed to be my favourite kit and it turned out to be my worst kit because this is the first time i use tamiya spray can on body paint.
I just need to know how to strip off the paint for now...and another problem...seems like TS36 had ran out of stock in my area