How to fix hairlines in hundreds of single PDF pages in one step?

Question

Could not create an action.
The thickness will be the same for all pages.
The menu allows to do it one by one but that means many hours...
Thanks.

Answer 1

This post
https://answers.acrobatusers.com/AcroJS-script-fix-hairline-width-q192774.aspx
where you also wrote, R Boulay says says that it is possible:
Long answer, requires Acrobat X or XI (or 9 but UI is different) :
1- Tools pane : Print Production : Preflight : Profiles : Options : Create new preflight profile : Fixups : All available fixups : Set minimum line width to 0.14 pt (edit as needed). Enter a name, save and close.
2- Tools pane : Action Wizard : Create new action :
Document Processing : Preflight (add to right side) : Uncheck "Prompt user" : Specify Settings : Run preflight check using : Select your new preflight profile in the menu.
Save & Export : Save (add to the right side) : Specify Settings.
Save, enter a name and close.
3- Enjoy your new Action!
Now the problem is the second picture in my past reply. No way to find in the «create fix-up» the menu that matches fix hairlines.
It is incredible how most of simplest problems in Acrobat cannot be resolved by a normal user...