Anything other than silicone..

Bobbo wrote:

4x4van wrote:

rerod wrote:
Ive learned on RV forums new silicone caulk will not adhere and seal to old :h...

Yet a Youtube search says the opposite.

And, you can believe everything you read on the internet. Including on this forum.

JIMNLIN wrote:

Ive learned on RV forums new silicone caulk will not adhere and seal to old and have avoided it like the plague since then, also considering how difficult it is to remove it.

Depends on the type of silicone being used.

What is the difference between acetoxy and neutral cure silicone?

***As acetoxy cure silicones release acetic acid whilst curing they can cause problems when used on certain substrates.
When used on natural stone they can cause discolouration, when used on certain metals they can cause corrosion and on bituminous surfaces they can cause "bleeding" of the bitumen.

So when applying sealant to sensitive surfaces we would always recommend using a neutral cure silicone over a acetoxy silicone as they will not react.

Generally acetoxy silicones are used for kitchens, bathrooms and other internal sealing applications as they are more cost effective and faster curing than their neutral curing counterparts.

Whereas **neutral cure silicones have better adhesion and weatherproofing properties** compared to acetoxy silicones making them the superior option for external applications.***