westend wrote:
I would remove the silicone caulk down to the finished surface and use the Proflex or other polymer sealants. Silicone is going to fail when exposed to the the weather, there just isn't any other thing to be said about it. It will also be difficult to bond any new silicone to the original.
Silicone sealants are excellent when bonding to surfaces in compression like a crankcase pan, a valve cover, or any other place where compression comes into play and not exposed to weather.
Once silicone has been used nothing..not even silicone.......will stick,
Unless you thoroughly clean area with a silicone remover (solvent).