You need no cement to put it on. Just lay door down flat on a table, loosten all the screws, take the old gasket out and put the new one on.
Use a little vegetable oil on the hinge side of the gasket and install door. It helps to have the freezer leaning back a bit. Put duct tape to hold the door shut overnight. By morning it should have pulled in all the way. | 
What should I use to install freezer gasket 
