What to use to seal this small crack?

[andypat]

I have a crack on the front porch that is about 10 FT long and only 1/16th to 1/8th wide. You think I could use caulking like you use around the bath tub? I seen the side walk at the Court House had some kind of rubber like calking in the seems/cracks. Here is a picture of the crack.Attachment 173114

[h2oboss]

Sika Flex......but you probably want to clean up the edge....an agle grinder with a diamond blade(masonry/tile) will help provide a nice crisp edge to caulk to