I am thinking about sending my Mak 90 (post ban) to Robar to have the entire thing coated in NP3 plus. I know it is an AK but I want the gun to last for a very long time without corrosion issues. I am not real worried about preserving the value of the rifle as i dont plan on getting rid of it. Anybody have any experience with NP3? Any advice would be greatly appreciated.