I think you are referring to black RTV silcione.
I run skateboard deck tape on all my guns that needed it. (Glock was stippled)
The tape on my 1911 has been spray painted and it still works like very nice checkering.
Cutting it out will be hard on your scissors, so plan to "use" up a pair and don't use your wife's best ones. Cut and stick, let cure properly and they'll stay on almost for ever.
KBK