All of the following is my experience and may differ from others. I'm just sharing my observations and experiences. I haven't seen any other durability reports about this product or combo, so I figured I'd share mine.
Here's my Mega that I coated with Norrell's tan. From day one, the coating was fragile.
NOTE: It only showed this fragility on the lower receiver. The buttstock (
plastic), upper receiver (
anodized aluminum - no teflon coating), barrel (
parkerized 4150) and rail covers (
plastic) I covered showed a ton more durability than the lower receiver.
There's about a dozen or so range trips on this lower and some basement drill practice, but nothing outrageous.
This was my third attempt to apply a good coating to this lower. The first two I took the standard precautions for coating and the coating was fragile from the start. The third time, I roughed up the surface with ScotchBrite, degreased, baked, degreased, baked, degreased and baked a third time, then coated per normal procedure. I used an airbrush for applications. While this showed a bit more durability than the first two attempts, I guess I wasn't too happy with the result.
My gut feeling is that it has something to do with the teflon coating and maybe with the chemistry in the Norrell's tan. I hear better results from Norrell's OD and teflon receivers.
This one's getting a coating of Norrell's OD when I get the garage cleaned up.
Just sharing. FWIW.