Sikaflex 221 & Vulkem Questions

[Hans627]

I need to seal between the bumper plate and the shell (under the rub rail) where there is a water leak on my 2009 25FB International (like so many other of this vintage).

I've never used either of these products. Is one better than the other for this purpose?

Are they interchangeable?

Thanks!

[rugjenkins]

They are interchangeable. I like the sikaflex 221 better. It doesn't attract dirt like vulkem

[Hans627]

Great and thank you!