Why plexi cracks?

[Vlad]

There are bits of info on VAF explaining cracked canopies and remedies mostly from those who have been there. Information is kind of scattered and many threads have to be reviewed to fish those bits. However I found nothing about the anatomy of a crack developed by a chemical, primary Locktite. I confess I sparingly used the matter two years ago and today noticed that every third/forth screw attaching rear window to the rollbar on tipup has those tiny beams around under them. They look like those sunlike pseudo-cracks around rivets on anodized spar. Will they propagate? What's the nature of the crack caused by the chemical? We have some knowledgeable folks here, please explain if you can.