Drilling Holes in. Level IIIa Ballistic Helmet?

I have a RBR Mach III Level IIIa High Cut Ballistic helmet that i just recently bought and i decked it out with gear needed to mount and operate Night Vision. I was going to sell it but now i think i might keep it.

It didnt come with any holes drilled to mount a NV bracket/shroud. I know that you shouldnt drill any holes because there isnt anything to seal the holes. From what i have read when the holes are drilled at the manufactuer they then put on the helmet coating which seals the holes.

I have read that some people apply epoxy to the holes thst they drilled them self and other products like that.

Does anyone here know of a way to seal the holes correctly and what type of product to use?
Thanks!

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Drilling Holes in. Level IIIa Ballistic Helmet?