I am sorry for the delay in answering. I dropped out of Penturners and did not notice your questions until a friend alerted me to them. I am here only to respond to your questions.
Why don't you use Gorilla for acrylics - I would think the Gorilla would stick to acrylic very well ?
I do use Gorilla Glue (original) for acrylics, and it sticks very well. Remember to wet the inside of the blank before inserting the tube with glue.
I do not use Gorilla Glue for
translucent acrylics (plastic blanks) because it does not dry clear. I do not want the yellow color of the dried glue to show through the translucent blank. I paint the translucent blanks, tubes, or both an appropriate color befitting the blank, then use epoxy because it dries clear and works well.
Also are there 2 types of white Gorilla ? I see people in this forum that say they use white Gorilla - BUT in the stores around me the only white Gorilla is in a round bottle and it is a wood glue - just like titebond or Elmers yellow - these wood glues are horrible on metal - I can ping dried wood glue off metal by flicking my finger
The Gorilla company makes and sells many different kinds of glue. Unfortunately, Gorilla has a branding issue. It is both the name of their original product "Gorilla Glue"
and the name of the company. (I once worked for a company whose name and product were the same, and it caused a lot of issues, so I feel their pain.)
Here are Gorilla brand products that I have discussed in the past:
Gorilla Glue (aka "Original Gorilla Glue") - This is a polyurethane glue that foams and dries yellow.
https://www.gorillatough.com/product/original-gorilla-glue/
White Gorilla Glue - This is also a polyurethane glue that foams. It is runnier than Original Gorilla Glue, dries faster, and dries white.
https://www.gorillatough.com/product/white-gorilla-glue/
Clear Gorilla Glue - This is a silane-based glue, different than other glues. It does not foam and it dries clear.
https://www.gorillatough.com/product/clear-gorilla-glue/
Gorilla Wood Glue - This is a polyvinyl acetate (PVA) wood glue, similar to Titebond II. It is white colored wood glue, used for typical woodworking projects for gluing two pieces of wood together. You may have been thinking of this glue, which has nothing in common with any of the glues listed above. I do
not recommend wood glue for pen tubes.
https://www.gorillatough.com/product/gorilla-wood-glue/
Gorilla makes many other glues for many uses.
P.S.
Q: What is the difference between "glue" and "adhesive"?
A: One can be used as a verb. The other cannot.