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PostPosted: September 27, 2017, 7:56 am 
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Joined: May 22, 2017, 7:36 am
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I've just installed the floor on the car and i'm looking for ideas for a coating for the underside while the car is upside down.

It's a steel floor.

If there is already a good forum link please point me in that direction, or if you have suggestions that would be great too.

I was thinking about a truck bed-liner type stuff sprayed over a good zinc base coat, but as I said, i'm open to ideas.

Picture of floor for happiness.

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PostPosted: September 27, 2017, 8:04 am 
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Joined: December 7, 2012, 8:28 am
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Location: Sarasota
I didn't like the truck bed liner and wouldn't use it again. I tried sever different ways and was unable to spray it. I ended up using a roller to apply it and it took a very long time.

Now I just use rattle can spray paint, its quick and easy. However appearance is way down on my list of priorities.

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PostPosted: September 27, 2017, 8:11 am 
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Good info, thanks.

Do you find that even with rattlecan, rust will appear, bearing in mind my car is an outdoor car, meaning it's not garaged.


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PostPosted: September 27, 2017, 9:47 am 
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only if its chipped or if you spill gas or something that eats away the paint. Its fairly easy to touch up though.

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PostPosted: September 27, 2017, 9:49 am 
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What would be a good solution for preventing rust build up between frame rails and floor?


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PostPosted: September 27, 2017, 4:08 pm 
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Joined: July 4, 2006, 5:40 pm
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Location: Novato, CA
Rustoleum makes a rattle can undercoating. I used it on my car, but a big can doesn't go very far. Good news is, after four years it's still holding up well.


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PostPosted: September 28, 2017, 7:55 pm 
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Location: West Chicago,IL
Rust-Oleum also can be had in pint cans. Pour it out and roll it about. If you are painting the frame, then you can match colors. I did gray on both frame and floor.

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PostPosted: September 29, 2017, 7:13 am 
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Joined: May 22, 2017, 7:36 am
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Ended up using this stuff:

Image

Very happy with it.

Kind of rubbery, looks like it will take a while to dry, but that's fine.


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PostPosted: September 29, 2017, 11:57 am 
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Location: Jefferson City, MO
I used rustoleum professional on the whole frame and under floor. I used the primer first then the darker gray on top. The light gray was too close a match to the primer that I wouldnt be able to tell where the top coat covered and didnt. I do plan to do bed liner paint in the foot wells and need to find something better for under the master cylinders. Just in bleeding the mastercylinders in the car, I had enough spill that it has blistered the paint. I need to find something that will withstand brake fluid better.

this stuff, only gray
https://www.lowes.com/pd/Rust-Oleum-Professional-Black-Flat-Flat-Oil-based-Enamel-Interior-Exterior-Paint-Actual-Net-Contents-128-fl-oz/3223667?cm_mmc=SCE_PLA-_-Paint-_-SprayPaint-_-3223667:Rust-Oleum&CAWELAID=&kpid=3223667&CAGPSPN=pla&store_code=1077&k_clickID=0d6282cc-2ed9-49d7-9545-1cdf44470adc&gclid=CjwKCAjw3rfOBRBJEiwAam-GsCDXMIjMsjlPmC19Bkt297XTmvjhCV3u-KAaf3o4MuzmTLEUr_MIxRoCTUMQAvD_BwE

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PostPosted: September 29, 2017, 4:25 pm 
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Maybe you could try 2 part epoxy garage floor paint for the master cylinder area?

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PostPosted: September 30, 2017, 5:30 pm 
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i have had good luck with http://www.masterseriescoatings.com/ind ... ts/primer/

it is bridge paint. It likes a rough surface. I use the silver primer then the AG111 black. USE A RESPIRATOR! even when rolling it on. A kit is about $80 (inc primer, pain thinner, etc) - it flows really nice, a little goes a long way.


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PostPosted: September 30, 2017, 6:21 pm 
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How about taking it to a place that applies pick up truck bed liner? It's a two-part epoxy-like stuff that hardens in a few hours.

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PostPosted: October 2, 2017, 4:07 pm 
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Joined: October 19, 2009, 9:36 pm
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Location: meadview arizona
i used a bare metal primer for use under automotive paint then i used a product called "stone chip" from upol in spray cans, it leaves a textured surface that can be sanded smooth then i applied a 2K primer and base clear top coating.

its been there for almost 5 years now and i live on a dirt road and no chips.

before you welded the floor to the chassis did you use a weld through primer?

use seam sealer to seal the floor to the tubes which eliminates the gap then prime and paint.

looking at where the welds are in your floor, you will have a lot of rattles between the floor and the tubes so get some welds in the middle to your tranny tunnel.

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PostPosted: October 3, 2017, 5:37 am 
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Joined: May 22, 2017, 7:36 am
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john hennessy wrote:

before you welded the floor to the chassis did you use a weld through primer?


No I did not, I went bare metal in the end then blasted everything with lots of layers of paint, it's been very rainy the last couple of days and I see now browning appearing yet, so that makes me feel good.

Also in the trans tunnel area and anywhere that didn't get spot welded I stitch welded from the inside of the chassis prior to wire wheeling and painting:

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PostPosted: October 3, 2017, 8:56 am 
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Joined: June 5, 2016, 7:03 am
Posts: 215
Location: ontario
On my first build the outside of the sheet steel floor was coated with a thick rubberized black product. This is messy. I used brush, spatulas and rollers, not spray. After 7 years it is still there; not a dent. I think that this is the kind of product after market shops use to protect underbodies. Except that they spray it. It does not look good but it does the job, which is what matters under the seven . I have used other types of products on my steel boat. The truck bed refinishing type did not seem to take weather well. Good luck :)


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