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Jul 21st, 2025 | | | | Joined: Sep 2011 Posts: 255 Shop Shark | | Shop Shark Joined: Sep 2011 Posts: 255 | Did the factory put anything on the inside of the outer fenders on a 1950 3800? Were they painted same as the exterior?
Thinking about using an undercoating but the inner fenders will protect the undersides pretty well. Want this truck to be a nice driver, not a show truck by any means. Advice?
Bruce | | | | | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | originally any undercoating was an option, and likely only on the underside of the cab .... haven't seen any documentation about paint on underside of the fenders, but I'd bet they were primer black with some body color overspray around the edges, like the hoods .... a good 'elastic' undercoating helps protect the paint job from star cracks that can be caused by stones thrown from the tires, inner fenders are no protection from that
Bill | | | | | Joined: Sep 2001 Posts: 29,262 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,262 |
Bruce,
Most people have found a semi-gloss black paint on the underside of fenders.
An undercoat might have been applied by factory/dealer/owner/no-one.
Go ahead and use an undercoat over good undercoat/paint.
| | | | | Joined: Mar 2010 Posts: 10,059 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,059 | My 52 had nice shiny forester green paint under the 1/2 inch of Highway Department provided free rust preventative (road tar)under the front fenders. Not enough made it to the rear fenders to save the paint, if there was any originally applied to save. That road tar preserved the forester green paint on the parking brake bracket which the inner fender bolts to, solving the mystery of what color it was originally painted.
Carl
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Nov 2010 Posts: 112 'Bolter | | 'Bolter Joined: Nov 2010 Posts: 112 | I used a gallon of bed liner on the whole underside of the cab and fenders. It was roll on so you can lay it on thick | | | | | Joined: Jan 2013 Posts: 1,518 'Bolter | | 'Bolter Joined: Jan 2013 Posts: 1,518 | I too will use bedliner on the underside of the cab and fenders. I actually used it on the bare frame too and love the stuff.
1953 Chevrolet 3100261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done In the DITY GalleryVideo of the 261 running1964 GMC 1000305 Big Block V6, sm420, the next cab off restoration
| | | | | Joined: Sep 2011 Posts: 255 Shop Shark | | Shop Shark Joined: Sep 2011 Posts: 255 | Well I went with an auto-store shelf brand spray under coating and after spraying and letting it set for about a week I could rub the stuff off with my finger (pretty disappointing).
So I pulled that stuff off, and bought a better quality paintable undercoating from UHC, it was about twice the price of the cheap stuff. The paintable undercoating went on much nicer and within a couple of hours was touch-dry and solid as a rock. Ya get what ya pay for!
Bruce | | | | | Joined: Mar 2008 Posts: 3,750 'Bolter | | 'Bolter Joined: Mar 2008 Posts: 3,750 | POR-15,my logic being a nice smooth gloss finish won't hold onto dirt and mud like a textured finish. Did my front and rears along with the rest of the underside. 5 minutes with a pressure washer and they look like new again...
Last edited by jockbolter50; 11/28/2014 11:58 AM.
1950 Chevy Advance Design 3100 in ScotlandIn the Stovebolt GalleryMore pix on Flickr. I've definately got this truck thing in my blood ... my DNA sequence has torque settings"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.
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