3M Rubberized Coating for interior panels...

[kmitchel46725]

I recently constructed a large box for my Grand Caravan, went from a 1.2 Qtc to ~.8. However with the extended LF, I've alot more panels resonating than I used to have. I've been looking for a inexpensive/effective solution, and thought about spraying the inside of the panels with a rubberized coating. I'm hoping it will add enough mass to get the resonance frequency up. So, I'm looking for feedback before I hack up my car. I do have realistic expectations, I'm not expecting Dynamat/Brown Bread performance. I'll do the most problematic panels first, and then work through the van if it works out. Anybody else try it?

Also, does anybody have any suggestions for improving imaging? The front 5.25's are not mounted symetrically, the passenger speaker is almost directly in front of the seat. You might as well listen to mono, well not quite that bad. I have no problem with fabricating some fiberglass pods, but I don't want to waist my time/money with trial and error. Just need some good pointers to put me in the right direction.

Thanx.

[petr0lb0mb]

I tried exactly that. I took apart half of my car and coated as much as possible. It did nothing. Don't waste your time.
I bit the bullet and ended up buying a bunch of Dynamat after trying all kinds of other home-grown ideas. The worst part is that the Dynamat won't stick to the 3M Rubberized Coating and so it has to be scraped off. Messy and a waste of time. 3M Rubberized Coating is good stuff for what it's intended for (Undercoat).

[kmitchel46725]

I spent a whole can on it, and quickly realized it wasn't going to be thick enough to do anything. My wife suggested an old foam matress cover we werent using anymore. After cutting and stuffing, it made a tremendous difference. Got rid of all the rattles except the latch mechanics, and the glass. Made a significant improvement in SPL on the lows.