I took the risk and went with trying it out. After cleaning and lube the gun I applied on the slipe of my P99. First of all this thing is very 'flaky', even with a damp cloth as they suggested to soften the compound.
After applying and buffing it out, I may be wrong but the finish on the slide looked more dull. I don't know why but it does. BUt I noticed hardly any dust or particles sticking to the slide.
Man, I am just worried sinde the black tennifer finish looks more dull.