What does stick to aluminum?

[BobbyW]

Vulkem 116
Product Description:
Vulkem 116 is a one-part moisture curing, gun grade polyurethane sealant. Vulkem 116 is durable, flexible and offers excellent performance in moving joints. Vulkem 116 does not require a primer on most construction materials.

Basic Uses:
Vulkem 116 is an excellent general purpose sealant designed for use in precast, masonry, window frame perimeters and similar types of construction joints. Vulkem 116 is suitable for continual immersion in water. Vulkem 116 is designed for exterior and interior use.

http://www.tremcosealants.com/produc...ct_id=1&bhfv=5

[markdoane]

From a previous thread:

Adhesion on aluminum -
Vulkem 636 - 3.5 N/mm
Sikaflex 221 - 4.4 N/mm

This seems to be backed up by 59Toaster's post that he thought Sikaflex formed a tougher joint on aluminum.