An important issue is the quality of the pumps. I started my pumping life with a cheap electric pump last year. After 6-7 months of unconscious training, I injured myself with a big bubble. Then I bought a classic pump with a gun from aliexpress. I felt it was much different from the electric pump I bought. The pressure in the tube was not electric and not uncomfortable.
Then I needed 2,125 tubes and ordered from major known vendors as they were not on aliexpres. My tube came wrong, but there was a brake gun with it, they sent it by mistake. I tried the gun.
There is really a big difference in quality with the brake gun I bought from aliexpres, as much as black and white.
Pressure is the subject of discussion here. I think the reason is bad indicators
I can pump 10 hg very easily with the aliexpress gun and it doesn’t bother me much.
I almost felt uncomfortable even at 5hg with the quality gun that came with it.
You can feel the pressure drops even if it is half hg.
At low hg, the seal is definitely not lost.
And the interesting thing is, I achieved the same quality in 20 minutes as I did in 2 hours with the aliexpress pistol.
Do not buy cheap products, friends, there is a really big difference.