What are you using for the undercoating of the fiberglass

[HealeyBob]

I have seen people rolling or painting on a black undercoating material. Does anybody know what the best product is for this?

[cv2065]

I use Herculiner

[rponfick]

I use Herculiner

Likewise, and used a roller. Much less mess and cleaning than spraying.

[Jeff Kleiner]

I've used Herculiner and then switched to Duplicolor Bed Armor (same end result as Herculiner but an easier clean up) but now use U-Pol Raptor and will never go back. It's a catalyzed two component product and the best by far. I spray it on but if you don't have the ability to do that it can also be rolled/brushed.

Jeff

[Dgc333]

My 33 is coated with Raptor, it was sprayed.

[Blitzboy54]

I am flirting with the idea of using some of the dynomat that I have left over and lining the underside of the wheel well with it before coating with bed liner. I am not sure if would hold long term. Going to goof around with it. May end up being a fools errand

[rich grsc]

On my old build, I used rust-oleum truckbed liner, then I used Heculiner. I hated it, very difficult to get the coverage I wanted, won't use that again

[Rebostar]

Raptor truck bed liner tinted grey. two coats.

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[edwardb]

X4 or whatever on UPOL Raptor. Used them all and then this. Won't go back.

[Jim Doak]

I used Herculiner on my first build and applied Herculiner on the current build last Friday. I'm happy with it but then, I've never used anything else.:rolleyes:

[Ford & Jeep Fan]

I am flirting with the idea of using some of the dynomat that I have left over and lining the underside of the wheel well with it before coating with bed liner. I am not sure if would hold long term. Going to goof around with it. May end up being a fools errand

I'd think that would work well for this type of thing. after all its not like your doing this for rust prevention.

[Mbufford]

Raptor is high quality stuff, and comes with the spray gun. If you have an air compressor that can handle it, that’s the way to go.

[HealeyBob]

Ok thanks for the responses. How much do I need for one car?

[Jeff Kleiner]

... How much do I need for one car?

When sprayed a Raptor gallon kit (which is 96 ounces of product + 32 ounces of hardener) will do a full heavy coat on the entire underbody plus a second coat in the wheelwell areas and leave enough material to do the wheel side of the aluminum splash panels.

Jeff

[MaxVmo]

I believe this is what was used on mine—a two part system: https://www.icrgladiator.com

[Theshandman]

I used Raptor (2-part) and rolled it on the inverted body. After drying I positioned it back on the buck and crawled under. Had a bud shine a focused light from outside close to the gelcoat and man! Did I really miss that much? Mostly thin spots and a bunch of pin holes. Touched up using the light as a tell tale. Great hack.