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  1. #1

    Default Best way to undercoat a truck frame?

    I would like to clean up and undercoat my trucks frame with a bed liner or a ruberized undercoating. My trucks frame is pretty rusty all around so im wondering what would be the best way to clean it up and undercoat it with. Keep in mind that ill be doing this with the body and everything still bolted on. Should I use a wirewheel to clean up the rust that I can reach and possably a rust reformer to spray on the parts of the frame I can't reach to sand?

    Thanks for your time and help all!
    1995 C1500 4.3L 2WD. JET TBI Spacer, JET stage 1 chip, 10mm Taylor custom wires, Pulstar Iridium Pulse Plugs.
    260k miles and still going strong...

  2. #2


    IMHO, I'd try to unbolt and take off as much as possible underneath to get nearly everything. I would take the bed off and drop the tank (safety and more coverage) which is not that hard if you have some help (a few willing friends) and try and get all that frame de rusted and coated. Under the cab I'd unbolt some things that might get in the way like exhaust and anything you don't want coated. I'd use sandpaper and even a wire wheel in bigger places. Hell just for giggles, I'd even coat the fender wells on the inside since the front 2 are already black from the lining.

    As for the coating, I think it depends on what your truck is put through (mud, gravel, etc.) to determine the best coating as one is more durable than the other in terms of peeling.

    If at first you don't succeed, get a bigger cheater bar.

    1999 GMC Sierra SLT Z71 | 5.3 "Vortec" | Spectre "Cold Air Intake" | TransDapt TBS | Hypertech 30005 Tune | 2005 Chevy Tail Lights | Denali headlights | Grill Mounted Fog Lights | AWS Bug Shield | 265/70/16 Futura Scramblers | Boss HD Speakers | 2005 Overhead Console | Flowmaster Super 40 mufflers 2N1O | Mostly stock-ish
    Bigger Amp Alternator | Electric Fans | Transmission Fluid cooler | Paint (Halfway there)| Interior Restoration/Upgrade with newer model parts | Window Visors (In channel) | Tint | Low-Profile Tool Box | LEDs throughout stock cab locations (68% Done) | And whatever is spurr of the moment
    CVN-69 "IKE-ATRAZ" AIR/V-2 Gear Dawgs

  3. #3

    Enkeiavalanche's Avatar
    Join Date
    Apr 2010
    Piermont,NY, back in Northern NJ now, But may be in IL soon....


    With where you live You would be doing a TON of sanding..If you have the time and funds strip the whole frame and get it Soda or sand's the only way to get it all down to bear metal...
    08 Z71 Avalanche Mods to date: K&N CAI,Hellwig Swaybars and End Links, Corsa Sport Exhaust, Superchips Programer,IPCW LOF & 3rd brake light and tails, AMI Gas door,Show Hooks and Door locks, Enkei Wheels, with Pirelli tires, StreetScene Bowties, Grant Steering wheel,Muth signal mirrors,SSBC Big Brake kit,Huskyliner Mug gards,Floor mats and Hood shield, McGard Lug nuts and locks, Bedrug, Cervini's Ram Air hood,35watt HID Fog lights, Sylvania bulbs all around ZXE's Highs and Lows, WhiteNight Back up lights,Sirius and HD Radio, SnugTop sitting on deck now Got a Softopper on now,Tempress Boat Hatches.... New Bilstein shocks are on... New Mods coming soon..... X

  4. #4


    I went at mine with a high pressure, high temp. steam blaster. got it down to bare mettal pretty well....... where i could easilly reach...

    the axle... still looks pretty damn crusty... but you need to lay down to see that.

    all the frame and suspention you can see from the street, i just blasted and then rattle canned. looks good enough for me, but when im under the truck im still reminded that "oh yeah, i bought this is SALT lake city UT"...

    the only way to get it NICE is to restore the truck and start taking things off. but its a truck, so first glace is good enough.
    Gas was $1.83 when Obama took office.....

  5. #5
    Master Mechanic
    KyleZ71's Avatar
    Join Date
    Jun 2010
    York and Wilkes Barre, PA


    Eastwood sells some pretty good products. Since I do not have access to a sand blaster I went that route. I used their rust dissolver (gel). Spray on, scrub, let sit over night, and rinse off the next day. Then I sprayed on their rust converter, letting it cure before I added a second coat. Then I sprayed on their rust encapsulator, letting it cure. Then I sprayed on their chassis black. I may use a rubberized undercoating before winter to give it that extra protection. All and all the kit and the rust dissolver cost like $400. Great products
    Objects in mirror are losing

    2003 Chevy Silverado Z71, 5.3L, K&N 57 series, 2.5'' Flowmaster Super 10 series dual exhaust , Corvette Servo, McNew Automotive Dyno tune, SS gauge cluster, Extang Trifecta Tonneau, Pacesetter shorty headers, Goodmark cowl hood, Sony Xplod speakers, Kenwood DDX-470 exhaust tips, 16" Ultra Badlands polished wheels, Pirelli Scorpion ATR .

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