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Grab an acid brush and the panel bond and apply it to the roof skin. I would suggest wearing gloves because the stuff can be really messy. Make sure that it covers the area you scuffed. Next grab a partner (this will take 2 or more people) and hold each side of the roof. Be careful not to touch the glue, or get your fingers caught in between the roof and the pillar.
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Lay the roof down where it needs to sit and make sure it is level. Next you will need to secure the roof to the car by using clamps. Do not make them super tight, just enough to see some glue start to squeeze out. Next pull out your welder or spot welder and spot weld the areas that you are able to.