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Undercoating & Seam Sealer ??'s

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81classic
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Undercoating & Seam Sealer ??'s

Post by 81classic » Tue Oct 21, 2008 6:59 pm

Alright guys, I'm working on the body, finally got it from the front garage to the back garage so I can actually work on it. The underneath is in really good shape but as I was cleaning it off this evening I noticed the undercoating is kinda powdery & flakes off in spots with compressed air. Originally I was going to clean, sand all the loose #### & hit it with some paint, but after seeing Skayser2's post that aint going to be good enough for me. :mrgreen: Sooo, what is a good undercoating to spray back under here?
2nd part, also as I was cleaning I noticed alot of the seam sealer is also dried and flakes off with compressed air. Should I go back through and reseal all the seams? I dont plan on doing this car twice, so its going to be right when I'm done this time. Throw some ideas out there, Thanks, Cliff
81 Malibu - Frame off restoration
05 GMC Sierra Denal 6.0l AWD
Cliff C.

v8power
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Re: Undercoating & Seam Sealer ??'s

Post by v8power » Tue Oct 21, 2008 9:08 pm

well i did my underneath with duplicolor professional undercoat, it is the only undercoat that i found that lays nice without any bubbles. i just let it dry hard and then painted it flat black.

Image
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Re: Undercoating & Seam Sealer ??'s

Post by v8power » Tue Oct 21, 2008 9:08 pm

aaaaahhh sorry for the big pic.
turbo lsx in progress...fall KOTS mayb?

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Ribbedroof
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Re: Undercoating & Seam Sealer ??'s

Post by Ribbedroof » Tue Oct 21, 2008 10:06 pm

81classic wrote: Should I go back through and reseal all the seams? I dont plan on doing this car twice, so its going to be right when I'm done this time. Throw some ideas out there, Thanks, Cliff


I think you answered your own question.....

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Ribbedroof
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Re: Undercoating & Seam Sealer ??'s

Post by Ribbedroof » Tue Oct 21, 2008 10:08 pm

v8power wrote:Image


What year is that frame? Supposedly, the 82 and up engine crossmembers are different, and that's the first really good pic I've seen

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NEW2MALIBU
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Re: Undercoating & Seam Sealer ??'s

Post by NEW2MALIBU » Tue Oct 21, 2008 10:11 pm

I just used Por-15 on mine.
Image
Image

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Re: Undercoating & Seam Sealer ??'s

Post by v8power » Wed Oct 22, 2008 9:00 am


What year is that frame? Supposedly, the 82 and up engine crossmembers are different, and that's the first really good pic I've seen


1984, it is a regal though so i dont know, but i think the front horns are different.
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ILLEGAL REGAL
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Re: Undercoating & Seam Sealer ??'s

Post by ILLEGAL REGAL » Thu Oct 23, 2008 6:10 pm

I stripped mine of undercoat and painted it body color and por 15'd the frame

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Image

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Re: Undercoating & Seam Sealer ??'s

Post by v8power » Thu Oct 23, 2008 9:58 pm

i like the underneath painted too, but i did not do an off body.
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Re: Undercoating & Seam Sealer ??'s

Post by ILLEGAL REGAL » Thu Oct 23, 2008 10:59 pm

neither did I ;) heck its caged, I couldnt even lift the body up off the frame

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81classic
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Re: Undercoating & Seam Sealer ??'s

Post by 81classic » Fri Oct 24, 2008 6:34 am

I was thinking about painting mine also, but since it will be raced & street driven quite a bit I'm thinking I need something a little more durable. I sprayed my frame with chasis black with a hardner, it seems pretty durable so far, I'm thinking about going that same route underneath.....
81 Malibu - Frame off restoration
05 GMC Sierra Denal 6.0l AWD
Cliff C.

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ILLEGAL REGAL
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Re: Undercoating & Seam Sealer ??'s

Post by ILLEGAL REGAL » Fri Oct 24, 2008 4:45 pm

mines a race car too that'll be driven on the street time to time.. no daily driver but I like the finished look and the goal is to have something that flies and is quality enough to not feel out of place if I entered it in a car show next to these $100k show cars

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Re: Undercoating & Seam Sealer ??'s

Post by Mike » Thu Nov 13, 2008 10:26 pm

Ive used 3M Body Schutz to undercoat cars and trucks that Ive owned since the mid 80s. Comes in a qt can, mix it well, screw it to the gun and start spraying. You can get a gun on ebay or Harbor Freight for cheap and always have it. The stuff dries hard and you can even paint it. I put 2 coats on my 81 and used a little more air pressure to make it a little smoother.

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81classic
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Re: Undercoating & Seam Sealer ??'s

Post by 81classic » Fri Nov 14, 2008 6:58 am

As I get under the car pressure washed I'm noticing the undercoating is only towards the sides. The center of the car is just paint. I'm leaning towards painting the underside, & undercoating the wheel well area's.
81 Malibu - Frame off restoration
05 GMC Sierra Denal 6.0l AWD
Cliff C.

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Re: Undercoating & Seam Sealer ??'s

Post by Mike » Fri Nov 14, 2008 11:12 am

I took off all the original stuff with a very sharp scrapper, cleaned off everything with thinners on a rag and shot it all with the Schutz. First coat went front to back, second I went side to side. I think it gave it a nice clean look. Just my opinion.

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