Sealing the outer frame of a Thetford cassette (1 Viewer)

[Fontie]

On our way down to Spain noticed the toilet floor in our van soaking wet, on further inspection the seal has gone between the cassette frame and the van, its cracked and there is a gap in it. What sealant would you guys recommend, its a grey frame so grey sealant would look best. Ive taped it wth Gorilla tape for now so hopefully will see us until we get home. I'll get some ordered on our way home.

Thanks

 

[KUSKUS]

Grey non setting mastic would be my choice.

 

[Fontie]

Thanks KUSKUS is there a specific brand you or anyone would recommend.