Anybody ever use HENRY'S roof coating on a car floor?

I'm replacing the foot wells on my 60 Elky and was gonna lap and spot/plug weld the patches and seal them with something.
Being a cheap SOB I was thinking I could use something I already have.
What I have is;
A gallon can of HENRY's Wet Patch Roof Cement,
Another gallon of HENRY'S Asphault Roof Coating and Lap Cement,
and a gallon of KOOL SEAL Elastomeric Roof Coating.

I figure one of these can't be too much different from that tar that's commonly called undercoating but I was wondering if any of you had used one on a car or was a roofer and could tell me which one would probably be the best one for the job.
I was gonna seal the floors and use it for undercoater in the wheel wells.
Am I nuts?

 

If you want a roofing smell in your car on a hot day,Your using the right stuff.The smell will go away but it will stink for awhile.

fitzee

 

I think I read somewhere about glueing carpet pad down with it..

..a Tex Smith article maybe?

Paul

 

Use some of the spray on bed liner from auto zone in a aerosol can. works great!

 

Doc, someone used the "Wet Patch" on the floor of my '81 Chev beater truck. It gets VERY sticky on a hot day. So I hope you plan on putting a rug over it.

 

OK, so the Wet Patch isn't a good idea inside, what about the other two?
Yes I will put in carpet and probably a polyethelene sheet barrier layer because I'me going to make some drain gholes in the floors so they won't rust out again.
I pulled one of the floors out by yanking on the seat belts!

No biggie, I can weld....

 

once I built a 39 chevy[1973]-he he .....I cleaned out the mouse piss and chewies-hosed her out and cloroxed it/let it dry a day or so.Figured it would not hold paint-
Then I brushed thin tar[for roof use] all over the inside floor and trunk floor.
I then applied two lawers of plain old tar paper......it was cheap and very effective-I never smelled it after carpet was in....I did let it set a few weeks before putting in the rug.....[I ALSO PUT ON STUDDED SNOW TIRES AND DROVE IT YEAR ROUND!

 

I've used the Henry's on many floors.. the thick wet patch stuff.

I put some on the bottoms of the new floor pans i installed on my 62 Falcon last year

I used it on the underside of some wide gl*** fenders we installed on a F-100 so the rocks would not crack the gl*** from the underside

 

Thanks guys,
I figured if it worked for a roof coat it's gotta be durable enough for a bottom coat.
I'll keep the sticky "problem" in mind. It's only to seal the joints inside and then there's Red/Green brand duct tape...

 

i've used it on the underside, just let it harden for a few days. i used seam sealer on the inside.