This plate is placed on a 45 degree to simulate that 4-5 o'clock area of a 5G pipe where things start to sag. Its not true overhead and not vertical either. But is a great practice plate leading to pipe
A Macro Etch test also known as a cut and etch test is a very valuable teaching tool. Its a destructive test but it can verify settings and technique and since you see the results in a matter of minutes, the puddle is still fresh in your mind. Did it penetrate like you thought? One Cut and Etch ...
Can one Technique work for all positions?
This simple technique basically just traces the front edge of the puddle where the rubber meets the road. But Cut and Etch testing is still one of the best ways to verify your technique and settings