The energy weapons you cited are, on their face, not equal to one another.
Use the DR scale, instead of a number of hits, to state the level of protection it provides. I.e., this can stop a PDR3 weapon 10 times, but is wasted after one shot from a PDR4 weapon. Doesn't have to be PDR, just using that as an example.
Also, what's the abaltive substance? Is it toxic when applied? When burnt away? Can it be applied to skin? Does it have a color when applied? How about a sheen or matte effect?
500 KS, by the way, seems ridiculously cheap for spray-on armor.