fix for cracked black roof plastic molding?

[Digital-Audiophile]

Im waiting eagerly for this fix When I went into the dealership a couple weeks back they were kind enough to offer to replace the rails with new ones until the fix was made. I declined of course becuase it is too much work and trouble and I don't mind waiting.

I also have a little dent on my roof ( I assume from a bouncing rock) that I want smoothed out while they have the top part of the truck all open and easy to fix.