What is the best for the factory type undercoating for a Mopar , thanks

Resto Rick sells good stuff.

Might be some others out there I have not heard about.

I've used Resto Rick's undercoating and it's good stuff.
Not sure if it's someone else's product re-branded.
The trick is duplicating the sound deadener on the insides of the quarter panels.
I have my doubts whether Rick's undercoating can get that much build-up, or be painted over.
But I hope someone can prove me wrong.

You can get the heavy buildup with Ricks product with a 3m shutz gun. You can also paint over it with no issues. It can be made to look very close to original if that is your goal. I just used it and it works as claimed. I prefer 3m stuff for cars that see weather, along with 3m cavity wax, in other words stuff that stays soft.

Thanks for all the info