Spray On Bedliner On Underside of Floors and Transmission Tunnel?

[2FAST4U]

Thinking of doing what the subject line says. Worth it? Messy? Good idea?

Thanks
Bill

[Ray W.]

I did it on the inside of the passenger compartment, over lizard skin. I didn't want carpet. I don't regret it. A spray on bed liner material would be good on the lower front of the foot boxes, right behind the front wheels. I used rustoleum "hammered" paint on those panels, and the road rash is already evident there on the driver's side after only 3000 miles.

[dallas_]

Under the carpet, or on the side under the car?

[edwardb]

My personal experience is that bedliner or any other kind of undercoat on the underside of the floors and transmission tunnel wouldn't do much. Keeping in mind we're not off-roading here and generally drive on pretty favorable roads. My builds have been only powder coat on the bottoms, and in many thousands of miles I rarely if ever hear anything hitting there. They do get dirty, muddy, dusty, etc. All the more reason IMO to leave them clean powder coat. Cleans up easily, if you're into that sort of detail thing. Now the splash guards and underside of the wheel wells are a completely different story. Lots of undercoat on the underside of the wheel wheels and at least a coat or two on the tire side of the splash guards. I've driven my latest build a few times around the block with the raw splash guards (only powder coat, no undercoat yet) and I'm surprised the pinging and whatever sounds that makes.

[GoDadGo]

I will be coating the back side of my body with U-Pol Tintable Raptor Bed Liner.

I've done some testing with it and it is Super, Super, Super easy to use plus it is a two part polyurethane. It comes with everything you need, except an air compressor of course. You mix this stuff in container that it is shipped in and once you activate it you pop on the spray gun and go to work. Texture is easy to adjust with pressure and distance.

I got the best price through AMAZON and the kits come in quite a other colors, but black is the cheapest.

Good Luck!

[wallace18]

I use bed liner on all outside aluminum panels that do not need heat or sound insulation. On those that do I use Lizard skin sound deadener and ceramic heat coating and have zero heat issues. Just my 2 cents worth. Check my build threads. Best of luck with yours.

[BEAR-AvHistory]

Same as wallace18 except for internal insulation. Been on for 18 months of daily driving & still looks fresh. Slick thing about it should it get dinged just spray some more over the ding. One thing to think about is a self etching aluminum primer to go on first.

Totally non-messy with normal care you would use painting anything on the car.

[WIS89]

Bill-

If I understand your question, you aren't asking about the value or benefits of insulation per se, but rather the benefit, if any, to using bedliner on the underside of the car, as modern cars use undercoating. If I am correct, I am not sure there is any particular benefit, other than perhaps some protection of the aluminum surface. I don't believe it would help you by insulating from heat for example.

However, I also don't see any harm. The modest weight involved would not be a detriment. It won't harm the aluminum, and as stated may actually provide some benefit to protecting that surface.

I am not sure if I have helped, or if I even came close to answering your question. I hope I have helped.

Regards,

Steve