Are blisters predictable?

So,
I´ve had blisters for pulling no more than 2 pounds,
or I´ve had no blisters from pulling with 4 pounds force,
and others are hanging 15 pounds without problems

Is this any predictable at all?

No. But generally the less air is in the system the better chance you have.

If we could predict blisters no one would get them. I’ve never gotten one but I take tons of caution.

The decisive factor doesnt seem to be the force applied

Is there any reliable way to prevent them by conditioning progressively or other ways?
What´s the cautions you are taking?

I kept my durations down and pressures down for a long time to condition myself. I pumped for years before using high pressure cycling then the LG hangar.

You simply are early to the game. Pumping with a cylinder would help you.

thanks

When you write blisters, do you mean edema, blood blisters, friction irritation, or some other form?

If you are getting blisters, I would stop and re-evaluate your approach while they heal. Repetitive injuries like blisters can cause a very nasty condition called elastosis, a disrupted structure of connective tissue molecules that can progress to ulceration that may need to be surgically removed.

I got repetitive abrasion from a hanger just below the glans on one side and it would get re-inflamed for months from just masturbating or pumping. I had to stop touching that area while masturbating to finally heal it.