How can I tell if an old sealer is silicone?

Question

The sealer between the roof and gutter is an unknown. It is the factory applied sealer.  Is there a good way to be sure it isn't silicone?  It does seem to dissolve in "goof off" so I think that is a good sign.  

Answer 1

you would need to know the history when in doubt remove the current caulk and replace with the rubex caulk on our site that was field tested to be compatible and won't void the warranty

Thank you