I am painting my car today. I am using a sharpe platinum gun. It came with a 1.1 tip which was not big enough so I ordered a 1.3 tip. The problem is that the 1.1 tip sprays pretty good, its just too small. When I install the 1.3 tip it blows pressure up into the cup blowing the top off and shoot paint out the vent. I put the 1.1 back in and it works fine. I noticed the 1.3 has like a rubber coating over the tip. Is that supposed to be there or is it supposed to be removed? Its the only thing I can think of, but don't want to remove it and ruin the tip if it is supposed to be there.
What the heck am I doing wrong!?