What is that putty on windshield pinch weld

The 3M strip-calk pictured below is the closest I found to that white putty found in our cars.. The 3M stuff is black (might be available in white, never checked) and comes in strips layered in wax paper in the box. When I was restoring my T-top Daytona these were all the products I used for the t-top area.

That 3M strip-calk always stays soft like butyl and is awesome for sealing seams and edges. I need to pick up another box of it for my Swinger restoration.