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For those who have used fatmat and have covered their door panels as well as rear quarter panels, what do you do about the moisture barrier? Do you take it off, fatmat, and then put it over the fatmat or what? I would really appreciate your help!

 
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that's what i did. i don't care how it looks underneath, and the putty stuff on the plastic is pretty sticky even in the cold, it'll hold on there.

 
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have you thought about spraying rubberized undercoating through the door holes? alot easier than putting one small patch in teh one spot you can get through, you cover almost the entire door skin.......

 
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what does fatmatting do?

 
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lowers the resonant frequency of a material and also makes it not deflect as many waves, or, in other words, stops rattle and stops frequencies from bouncing and causing cancellations

 
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hi, let's say I get rubber undercoating,

where should I apply it? what little holes?

can I apply it at the "inner side" (the side passenger/driver can't see) of the plastic panel? or we have to apply it at the metal part of the door exposed after the plastic door panel is removed?

 
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the little holes all aound yoru door frame, the idea is to get a nie coat over your entire door skin on the outside.

dont forget to cover yup your windows! dont wanna get any of that nice rubber overspray on them!