Removing undercoating

[YogiBearandBooB]

Originally posted by Ed:

After you remove the undercoating. And After the marine clean, metal ready, and POR-15 . Then what? Do you put new undercoating? What kind?

I think he's asking what to do AFTER the POR15 thing. I don't think undercoat is necessary after THAT. It may not hurt, but should not be required.

Originally posted by skip260z:

You have to, else the road debris will sandblast the thin paint that Datsun used. Especially at the footwell areas were your feet would be.

If he did the POR15 right, there wouldn't be any "thin paint that Datsun used" remaining to worry about. Only super tough POR15!

Originally posted by skip260z:

If I were to go to the extreme of removing any more undercoat than I had to already, then I'd POR-15 it. That stuff is supposedly tougher than powder coating once cured. Beats the tar/asphalt stuff for protection.

Isn't the "tar/asphalt" stuff on theINSIDE of the car? Under the carpet? I don't believe it's there for "protection" from anything except road noise.

[skip260z]

Originally posted by YogiBearandBooB

I think he's asking what to do AFTER the POR15 thing. I don't think undercoat is necessary after THAT. It may not hurt, but should not be required.

Agree completely!

Isn't the "tar/asphalt" stuff on theINSIDE of the car? Under the carpet? I don't believe it's there for "protection" from anything except road noise.

On my (3-previous owners) 260, there was nothing under the majority of the carpet padding, just the painted steel. I think the carpet padding was/is supposed to be the major sound-deadener.

But I did notice that here and there along the tranny tunnel and hatch floor area, there appears to be strategically placed "layers" of body-painted asphalt. I guess for added sound deadening.

The undercoating on mine was asphalt/tar-based. A steady stream of carb spray soon had it melting away.

[Ed]

So let me get this straight. After the POR-15 has been properly applied to the under carrage (wheel wells, tranny tunnel etc..) that's it. Nothing else is required. The POR-15 will outlast the car.

[skip260z]

Originally posted by Ed

So let me get this straight. After the POR-15 has been properly applied to the under carrage (wheel wells, tranny tunnel etc..) that's it. Nothing else is required. The POR-15 will outlast the car.

That's how I'd go.

From everything I have EVER heard about POR-15, it is harder to remove than a bad politician.

So it's probably better than any known asphalt-based undercoat you could add.

[Bambikiller240]

That's what POR15 manufacturer and distributors claim.

your can read for yourself at the URL's

http://www.por15.com/index.html

http://www.thefinishedlook.com/main.htm

I used it this past summer and it seems to be really tough stuff.

[EScanlon]

POR alone will haze or cloud up from UV light. It doesn't hurt it but cosmetically it will look as if you coated it with talcum powder.

The Chassis Coat is an excellent product to put on it. You can get it in gloss or satin as well as other colors. The combination between POR and Chassis Coat is excellent in my opinion.

Undercoating, on a properly prepared, rust-proofed and painted underside has additional benefits other than "protecting" from road grime.

A good coating applied uniformly, on a clean base (i.e. not 6 months after applying the POR mentioned above) will help quiet the under pan from rock, gravel and sand noise. It will also "deaden" any vibrations in the sheet metal. This will actually help reduce noice in the car, just like the tar paper coating on the interior.

When I did my car, I POR'ed the interior after having sandblasted the floor pans, then I applied a seam to seam total pan (including tunnel) covering of the OEM style Tar Pads. I put them on from the bottom of the cowl bucket all the way to the tail light openings. (Except for the wheel wells and shock towers) I even put some inside the tool compartments.

These pads aren't cheap, and they aren't light, but the difference in the car is nothing short of astounding. The car is QUIET! I'm not talking Acura level quiet (sorry, that's my "luxury" car), but definitely, in my opinion, quieter than my wife's Subaru (although she says it isn't). However, although we might disagree as to the level of noise reduction, we both agree that the reduction in cabin noise is not only drastic it is incredible.

The pads are called Q-Pads and they are by EverCoat. I paid about $20 for 6 12"x12" (nominal), and it took about 8 packages to do the complete floor pan, the inside of the doors and inside the rear fenders. Expensive, but the ride is so much nicer.

Hope this helps someone.

Enrique