Fill a large, deep crack in outdoor timber

[StevieGee]

Hello.
What should one fill this crack with?

 

[tobben87]

Elastic soft joint for outdoor use, then paint over it with color.

 

[Peter2400]

Agree with tobben, this sealant is used by professionals who work with windows, I have heard that it is supposed to be good.
https://www.leifarvidsson.se/laseal-vit-fonsterkitt-290-ml

 

[StevieGee]

Thanks for the info, great link.