Daisy,
There will still be a coating of silicone unless one is willing to
completely remove the silicone which *means* going down to bare aluminum.
There is no other way to remove all traces of that stuff. Silicone is good
stuff and there's good, better and best silicone out there .. BUT ... it's a
bitch to remove and that entails going down through all the traces to bare
metal.
If any silicone is left any attempt to cover up the traces of siliconw will
fail. This is one reason people use other types of sealers in my opinion.
This is just what I know.
Tom