Modern dum-dum

[jneely]

What are folks using as modern equivalent for spray on insulation? Not looking to send it out for rhino or linex, and have a bad taste for the DIY variants of truck bed liner. Need sprayable, like original, as there’s an asphalt pad, like dynamat, over top of the dumdum.

Lizard skin seems close. Any experience with that? Aeros has dumdum on the underside of rear wheel arches. Applied before paint and/or undercoating. Not sure if the lizardskin stuff is that versatile. Need to get into it now, while the cars still in epoxy primer, then I can seam paint

Any help appreciated.

[MarkH]

The only soundproofing I re-did in my car were the floors. My floors had what appeared to be some sort of brittle tar like substance with sand mixed into it, applied under & over the perforated waterboard panels. I didn't want to use that again so I filled the grooves with clear silicone, then silicone glued replacement panels down, topped with a generous coat of silicone. Trunk floor just got the groves filled. That seems to have worked good but I can tell that doing all the areas in the manual would've made it even more quiet.

It's not OEM, but floors & the entire underbody including fender wells got a mildly stippled chip resistant paint similar to bedliner. I have a minimum of 2 1/2 miles of oil & chip to drive over before reaching any hard road, and I'm glad to have it every time I hear a chip(s) hit the underside.

[jneely]

Thanks! I bit the bullet and ordered some second skin spectrum. Same concept as lizardskin but designed to stand up as undercoating. I plan to do floors, roof and trunk then paint. Then dynamat or equivalent in place of those original perforated matting with jute to top it off. I'll do the rear fender wells after paint.