new formulations to make ER meds abuse proof

so I haven't taken Extended release meds in a few years and just started again. I was take oxycontin and it was like slimy when wet and was like plastic. It seems to make my stomach hurt. The last time I took the old ones years ago i never felt that way.
I"ll be doing opana ER here soon, is that the same type of crush proof? I don't crush mine so i don't care other than it doesn't feel like they work as well.
What are your opinions

I've been asking a lot of questions recently and I appreciate the patience and answers. I'm not new to CP, but haven't been in active treatment for a while...kind of.

The info at the link below should help. Also click on the link that says Prescribing Information.

Opana ER-
www.opana.com/prescriber/