Glue plexiglass (styrene plastic)?

[BigR]

Which product should I use to get the most stable repair? The board is in a shower wall.

 

[Peter2400]

I have discovered the glue Loctite power flex, a super glue that actually works.
Costs almost nothing to try, 30:- if I remember correctly.

 

[BigR]

Yes, it's great. I've been gluing all fall with one of those. The gel is good because it adheres to surfaces where the thin superglue gets absorbed.

For plastic sheets, I heard that there are glues that react with the plastic and "weld" it together. I've looked a bit at Loctite, but their product pages were hard to navigate. Also, I don't know much about plastic types either, styrene, PVC, ABS, poly-something, and all the others. They might require different glues.

I would like this bonding to be neat, sturdy, and permanent for over 10 years.