I have sliced many grommets in my time. If done properly, you really don't need to silicone. If you do silicone it, I would do it after the grommet is installed in the firewall. Actually, I'd wait until the car is running & done.
Just my .02
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Tod Hoffmann
1966 GTO Montero Red Hardtop - Holley EFI'd 462, KRE DPorts/Muncie 4spd
1990 Chevy 454SS pickup - Accel DFI/T56 6spd - Hot Rod Power Tour Long Hauler
1996 Chevy K2500 ECSB 'Poopy'
2002 Honda VTX1800C
2016 Cadillac CTS Premium
My project thread: http://forums.maxperformanceinc.com/...d.php?t=516826
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