For what it's worth, I read not to shoot straight into the bicep. A bit on the side/top, going in at an angle.
I did this ONCE with synthol, not much experience but I did try it just once and scared the hell outta me.
Before the shot got spread out, I had this f'in bump that looked just like those synthol retards and was scared I ruined a muscle I had to business playing with as I don't need any there.
Anyway, I started doing curls to get the oil to spread out and it did, but FUUUCCKKKK, the pain it causes is too much for me. Could barely hold my gym bag. Was also working as a doorman and knew I could not defend myself or even escort a client out had something happened, lol!
The process is true meaning of being jacked and totally useless muscles, lol...