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Old 08-26-2013, 03:59 PM   #1 (permalink)
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Undercoating products?

I am looking for a product that I can spray on the underside of the car as well as something to spray on the underside of the fiberglass body. Is there a product out there that can accomplish both, or will two different products be better?

The car is going into alignment this weekend and the guy aligning it said we could use the lift to apply undercoating to the chassis and footboxes if we want.
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Old 08-26-2013, 04:50 PM   #2 (permalink)
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Just my own opinion, but I wouldn't spray the entire underside of the car.
There are spray cans of rubberized undercoating that will work well on both the fiberglass, and the aluminum. Some use a bed-liner material.

I first painted the complete underside of my body with an epoxy paint to seal it. Before installing the body, I sprayed a bed-liner in the wheel arches. After the body was on, I used a spray can undercoating, on the aluminum in those same areas, mainly to seal off the seams, as well as to prevent road debris pinging off the aluminum...
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Old 08-26-2013, 04:58 PM   #3 (permalink)
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I did not spray any of the frame or aluminum panels. Sound and heat products (stick on) were used on the inside of the cockpit though).

For the fiberglass body we used ceramic-based Lizard Skin. This was for several reasons including fire protection, rock chip/crack protection from debris thrown from the tires, insulate the body from driveline heat, and to give the visible fiberglass areas (engine bay) a uniform color and texture.

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Old 08-26-2013, 06:05 PM   #4 (permalink)
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I know its not spray on, but I used Herculiner on the complete fiberglass underbody as well as all aluminum pieces that were directly exposed to the tires or the road.

Rolls on easy, and is durable as hell. I also rolled it on the decking of my trailer and drive my snowmobile across it regularly without issues.
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Old 08-26-2013, 06:20 PM   #5 (permalink)
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FWIW, My painter sprayed a 3M product under each fender well to prevent stone chips. I dont recall the exact name, but it may be the Body schutz product.

When the car was finished, I sprayed the Al panels with 3M undercoating out of a spray can, on the underside for added protection. After about 2500 miles I can see significant wear on the spray can application and zero wear on the body shop stuff. I would use the best stuff possible under the fenders.
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Old 08-26-2013, 06:28 PM   #6 (permalink)
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i used Heruliner for the splash guards and wheel wells because it's the "blackest black" product out there. those parts are visible.

for the body underside to keep the thrown-rock noise and threat down, i used rubberized spray undercoat. goes on brownish, dries blackish, but not as black as the herculiner.

like mentioned above, i would not do the entire underside of the car. it would probably look nasty and it's not necessary.

what's the specific purpose of undercoating your whole underside of the car?


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Old 08-26-2013, 06:43 PM   #7 (permalink)
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I don't know that the intention was to coat the entire underside, more just the aluminum panels that are exposed to road wear.
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Old 08-26-2013, 09:30 PM   #8 (permalink)
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interesting, my underside panels have NO road wear. remember, they are tucked up over the round tubes a bit. the lower front nose of the car is only a few inches off the ground and it's TRASHED - that must have kept everything from bouncing underneath the car.

i lived in PA for two years, i know all the coal & sand left on the roads after the winter, that may come into play.

now under the sidepipes behind the front wheels - TRASHED. strange, they are totally shiny on top but trashed on the bottom.

it's the owners perogative, but i would recommend not undercoating the underside of the car.

not to hijack, but if you are really worried about protection in general, by far the biggest area of concern is the nose. check out my post on the clear bra:

3M 90000 Paint Defender spray-on clear bra, just $30

i am 100% sure it would protect the bottom, and it will peel off if you want to. you'd be the first to do it!

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Old 08-26-2013, 10:12 PM   #9 (permalink)
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Front nose trashed

Eddie - I just finished fabricating a little "rub panel" to mount on the underside of the center of the nose - used a nylon cutting board (found a black one), and cut it to the shape of the front center nose area. I counter-sunk some holes in the material to mount it, that way, only the material will scrape the ground, not the fasteners. I'll post some pics as soon as I can mount it.

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Old 08-27-2013, 03:44 AM   #10 (permalink)
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Duplicolor bedliner ....

Not a spray-on, but works very well.

Took my roadster out yesterday ... and rolled it over

HTH

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Old 06-02-2014, 04:23 PM   #11 (permalink)
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I am thinking of using Herculiiner on the underside of our body. What steps should I take to prep it berfore application? Also, what about the areas of the body above the tires? Have any of you applied a barrier of some type to protect against rocks being thrown up and causing checks in the finish of the top side?
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Old 06-02-2014, 05:01 PM   #12 (permalink)
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Quote:
Originally Posted by haroldd1963 View Post
I am thinking of using Herculiiner on the underside of our body. What steps should I take to prep it berfore application? Also, what about the areas of the body above the tires? Have any of you applied a barrier of some type to protect against rocks being thrown up and causing checks in the finish of the top side?
Herculiner or one of the other truck bed liner products works very well for this purpose. Typically a single coat all over the underside of the body, and multiple coats (3-4-5?) in the wheel wells. Many, myself included, also do the exposed side of the splash guards (elephant ears) with the same material. This will get the job done.
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Old 06-02-2014, 05:41 PM   #13 (permalink)
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I see POR 15 is now making a undercoating that may be worth a try as their paint is some of the best metal paint around
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