Niflor, a composite coating of PTFE and Electroless Nickel, is a process for metals that results in an accurate, low-friction surface that is extremely hard and resistant to wear.
TriCemĀ® is one of the most wear & abrasion resistant coatings ever developed.
Low friction, self lubricating surfaces.
Excellent wear resistance.
Good corrosion resistance.
Uniform coating thickness.
xylan,xylar both contain ptfe and can be sprayed without keying the surface and dont need the heat that teflon does to cure.
The above are far superior to just teflon just way more expensive.
As for weakness its down to heat alone if you heat metal and cool it in different ways you can make it soft or brittle ..