I was able to forcefully peel that marinetex out w a flathead screwdriver like it was a bad calus.
I reckon nothing holding my rifle together is allowed to be so lame.
This time around I am going to use DEVCON PLASTIC STEEL SYRINGE #62345
***Undecided on release agent
Will scuff composite stock w some 60grit or similar then prep all areas of stock w Denatured Alcohol.
The hard peeling out of material around recoil lug was right on the cusp of acceptable result for me, it being bolted down/held in place by action ad having a wall forward and back of it, it aint going anywhere
The chilling out and flexibility was a HARD NO, this stuff is supposed too be "hard as steel" and "thread tap"
There was no way my mixture was correct this stuff wasn't drill and tap compatible
Live and learn through experience
Or pay a pro