Check out the seals around the lights, you might be able to pick up something from Clark Rubber or similar to replace the seal around the taillights. Also the seal around the tailgate door is notorious for leaking.
To test for leaks, use a watering can. You can get them for $5-$10 from Bunnings or similar to test spots in isolation.
If you do need to use silicone, use a neutral cure silicone or a specific automotive one as many silicones on the market are acetic cure (read it'll rust your care away).
1991 Golf GTI Manual - Tornado Red (Little Red Wagen)
1998 Golf Cabriolet Manual - Black Magic Pearl (aka Rommel's Panzer) Deceased/written off
1993 Golf Cabriolet Manual - Alpine White (aka Hitler Youth Wagen) Deceased/written off
1976 Golf LS Manual - Bronco Brown (aka Roadrunner) Deceased/worn out
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