John, can you explain the procedure for Urethane installation?

I know this discussion comes up from time to time and you believe Urethane is the way to go. I've read of using setting blocks and trial fitting prior to urethane sealing. I have the 3M automix gun and cost difference either way is negligable.

The 3M ribbon seal that is closer to OEM but it has no adjustment range. You pick 5/16 or 3/8 and take what you get as a result. Actually, the OEM was thiokol, which isn't available anyway, so discussion about what was orignal seem irrelevant. Explanation of keeping passangers inside the car during collison are not important either, as NTSHA found ribbon was adequate and equivalent.

I'm most interested in installation ease and more importantly, the outcome. TIA.