Hi, I am in the final process of building a bunch of K9YC chokes. I made 5/8" vent holes in the Carlon boxes and then bought some to cover the holes. I though it was plastic screen - turns out it is a fiberglass mesh. Are there any precautions that I should follow for cutting it and sealing it in place with RTV? Tnx & 73 Bob, KQ2M