Sealant that doesn't mold

[DIY67]

A few years ago I posted this same question about a white sealant that will not attract black mold and was recommended Dow Cowling. Well I can tell you that it is no good because black mold has grown on a lot of it in the last few years. Even more extraordinary is the very old sealant that was here before I moved in 24 years ago is still mold free. Work that one out!

Even the new windows we had installed over 3 years ago have started to get mold. It seems they just don't make it as good anymore.

 

[just pumps]

Perhaps there was something in the very old type of sealant that was banned? Is it a very damp property?

 

[TeaAndBiscuits]

I think it's partially to do with how it's applied as well - even the best anti mould silicone will probably be overcome if you use e.g a licked finger to smooth it - bacteria etc from your saliva becomes embedded in it and away it goes. That's an extreme example but you get the idea. Just applying it on a surface that has not been sterilised first may also be doomed from the outset.