replacing undercoating

replacing undercoating

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By rexbd - 14 Years Ago

I need to dress up the fenders on my 55 Tbird as part of my restoration project. I wanted to avoid having to strip the old undercoat and if possible touch up the few spots where it has flaked off. How have others tackeled this project? If I have to strip and start over, any advice on best way to tackle that process?

Thanks

By Glen Henderson - 14 Years Ago

There are some pretty good rattle can undercoats out there, I think Eastwood has one. I would scrap any loose or flaking old materal off and just spray the affected area's. I have used it in the wheelwells of the Falcon because the old stuff looked so bad and I did not want to take the time to strip it good enough for paint. I'll be back in the shop this afternoon and will try to get a picture.

By Bob's 55 - 14 Years Ago

I use a product called Westley's Rubberized Under Coating that seems to work pretty good. Sez right there on the can "New-flexible water displacing" and "can be used for Rust Prevention, Sound Deadening and Dressing Tree Wounds", among other uses. What more can you ask for. Comes in a 20 oz. aerosol can. I got it at Pep Boys.

By crenwelge - 14 Years Ago

I use one of these to remove undercoat as well as rust. I brought one along from Germany a few years ago, but they are available in the US now in pneumatic and electric. I have bought a couple more of them on eBay.

http://www.monti-tools.com/e_video.php

By Ol'ford nut - 14 Years Ago

Bob's 55 (1/28/2010)

I used some of this stuff, was really happy with it. I would suggest cleaning up areas and priming before applying.

By PF Arcand - 14 Years Ago

Be careful to ensure that there isn't further rust under the edges of loose undercoat. It's notorious for trapping moisture,dirt, salt etc. Another re coat product that might be available is Pro Form pf 715 which is sprayable with a siphon style gun. It's also paintable. Available in 28.7 oz screw attachment cans.

By Hoosier Hurricane - 14 Years Ago

Years ago when I restored my Bird, CTCI ruled that Birds were not undercoated at the factory. Dealers undercoated them if the customer wanted it. I don't know the rule now. If you are restoring to CTCI standards, and the rule hasn't been changed, then removing the undercoat completely is the plan. If you are not going for a perfect CTCI score, repair the undercoat and enjoy the car.

By 56 big window - 14 Years Ago

ive used spray on bed liner with great success.goes on clean , you wont trap moisture and its super durable . moreso than undercoating

By speedpro56 - 14 Years Ago

John, my experince with undercoating thru the years of buying and selling old cars from the 50's was the ones that were undercoated from the dealership actually had ALOT!!!!!!! more rust than the ones without the undercoating. When it cracked it could hold water and there you go!!!!!!!!!!! the rust cancer started w00t

. Don't want it on mine but the products being used today seem to be alot better than in yesteryears.

By crenwelge - 14 Years Ago

I agree that cars were not undercoated at the factories. I was born in the Texas Hill country and grew up there. I started dismantling cars in the late 50's. I had never even seen undercoating until I bought some wrecked vehicles out of the Midwest in the late 60's.

By paul2748 - 14 Years Ago

Hoosier Hurricane (1/28/2010)

Concours original no undercoat. Concours Non original ok.

By rexbd - 14 Years Ago

Thanks for all the replies. Very helpful. this is the best car forum out there.

By Glen Henderson - 14 Years Ago

Sorry about the delay getting back to you, but you have got some good advice from other members. Here is the stuff that I use, I got it from my friends body shop.

This is what it looks like and I understand that you can paint it.

By Old Y Block - 14 Years Ago

I have used rubberized undercoat and it works fine--if it is not put on very heavy otherwise it will crack and let in moisture. Use just enough to cover the surface.

Old Y Block

By uncleaud - 14 Years Ago

When I stripped the undercoating on the bottom of my 57 bird I didn't find any evidence there had ever been any kind of of paint on the bottom of the body. It was in rough shape but where the undercoat had stuck good it was like new metal, maybe a hint of some kind ot thin black paint. I'v always wondered why the concourse people want the bottoms treated like the top when Ford never did originally. I used 3m rocker shutz..not the body shutz..it's tough and paints good. i also used a product by Fusion that painted over good. It actually covered better and looked like the original.

By Duck - 14 Years Ago

There's actually 3 different products mentioned here. 1) rustproofing- a non hardening, waxy, grease like thick bodied goo, on the order of Cosmoline/ (smells nasty) 2) Sound deading undercoating- smells a bit like tar. drys /hardens to the touch. All it really does is add mass to the sheet metal so it won't resonate as easily. 3) Rubberized undercoating- Applied only in areas (generally wheelwell area) where stones and gravel would be expected to abrade paint, causing rust. Gravel will "bounce" off the stuff harmlessly....

By Bob's 55 - 14 Years Ago

Not to mention Body Men like to use it to hide shoddy work...

By Y block Billy - 14 Years Ago

Rubberized flashing cement for roofing is the same stuff as rubberized undercoating, yet 1/10th the price. you can usually find a 5 gallon bucket kicking around someones barn for free. Mix with thinner, put in paint shaker until desired consistency and use as undercoat. I even mix more sometimes to use through old paint spray gun and use for black paint on chassis parts. I have been painting implements for years with the stuff and left out in the harsh Maine elements they do not rust.