Is butyl sealant necessary

This subject has been brought up many times in the last few weeks. Butyl does not harden and stays in it's gooey form to prevent leaks. Urathane will harden(not rock hard) so you better get it right the first time or it may be a beeaatch to seal once cured. I searched the net and found alot of good info on some Mustang forums on this matter.

You will want to prep the area before install. Clean, prime, paint.