Only if you are touching it or mishandling it. Air is exposed to any needle that you pin with but its fine as long as you do not touch it. I been doing it for a long time. It works fine you only have the plunger out for a few seconds
Only if you are touching it or mishandling it. Air is exposed to any needle that you pin with but its fine as long as you do not touch it. I been doing it for a long time. It works fine you only have the plunger out for a few seconds