Windshield Install question

[liftlawssuck]

I have searched the archives and found many tips and tricks but alot of different methods.

Do you need to put a sealant down first before installing windshield?
I have a new windshield, new rubber seal from GM, and the whole cab was stripped and painted. So the windshield area on cab is like new. The rubber seal is the 2 piece kind having that lock ring to install after.

So again. Do you need to seal the gasket in place?

Any other tips would be helpful.

Thanks, Brian