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[VAC] Silicone vs. vulkem



Greetings Fellow Fanatics. My '66 Globe Trotter has many applications of different caulks. Most recently, silicone seems to be the caulk of choice by previous owners. In preparation to polishing, I plan to clean up the caulking. In some places the silicone doesn't seem to adhere well, but in other places it seems well sealed. My basic question is," What's wrong with silicone?".  Should I remove all silicone and replace it with Vulkem? Why is Vulkem better, if it is?
Thank you,
Rick Langer