I plan on doing the body work and primer on my resto project. I have read a couple books and many posts on this site. They are very good. I went to my local PPG distributor today, and inquired about product. He advised me that D822 corrosion resistant primer (Global product line)will serve my needs and take the place of spraying an epoxy primer over those bare metal rust patches and also serve as a primer surfacer. In other words, he says I can go with one product (D822) instead of the old standard DP40 that would be sprayed first on bare metal and then covered with a primer surfacer (2K I believe he called it).
My question is, should I go with this product? I have no experience spraying paint or primer. I was planning to sand my old paint but not remove it, as it is in relatively good shape in many locations. I do intend to weld in new quarters on both sides as rust has gotten to the old ones.

First of all remove the old paint. If you dont more then likey it will come back and bite you in the butt. Removing it just makes for a better stronger foundation. Why fix the roof if the basement walls are crumpling? Who knows the car could have been painted before and who knows what kind of paint they used, and if you dont know its just better to remove it all together.

Secondly I've never used that D822 so I cant tell you what excatly it does or what use it is intended for. But what I can tell you is that appling dp40 over bare metal is not a good idea. First you want to apply a wash primer or self etching primer. The PPG# is dx1791, this primer has the corrosion resistance that is needed and great adhesion. Then I go over the wash primer with my expoy primer.

PPG does have a (Global line) primer intended to go directly over metal in one step and be durable like an epoxy primer. It's called Uniprime DTM but I don't know if the part number on it is D822. PPG's site is down right now so I can't check. Try www.ppgrefinish.com (http://www.ppgrefinish.com) to get answers on all your PPG stuff (when it's up).

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Rick Sutter
Member #383
'67 Chevelle Super Sport
67SS.com (http://67SS.com)

thanks for the replies. I'll check the ppg site for their info.

I've used the DTM... very nice stuff indeed!! it does coat well and is extremely durable! However, like other primers it shrinks at a pretty good rate, so let it sit a while before you sand and topcoat! Good Luck

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X-Ray View of my Chevelle :D (http://www.normieschevelle.com/sideview.jpg)
Getting Closer (http://www.normieschevelle.com/passfull.jpg)

bhawk, I did some looking about the 822 primer you talked about. Its a global product like you said with the number of DTM822 meaning Direct To Metal. The stuff can be used as a primer surfacer or non sanding sealer. It states that over metal a min of 2 coats must be applied to achieve proper film build. But it also states for maximum corrosion resistance apply one coat of D831 chromate free wash primer first then the DTM822.

To answer your question about using this product ask your paint dealer if any body shops in your area for using the stuff, and ask the body shop directly. The body shop will give you a more detailed answer then the paint dealer.

Hey SEVT,

Just a heads up, but the D822 and the DTM primers are two different products.
The D822 is a Corrosion Resistant Primer Surfacer. It comes gray in color, builds well, and is good for small bare metal spots which have no visible signs of corrosion, ie. surface rust. I would not use it on large areas of bare metal without first applying the previously mentioned wash primer...D831 in the Global case.

The DTM primers are also in the Global line, however are designed to go DIRECTLY to metal in all cases. They are designed to be completely self etching and build well. I also say "DTM primers" because there is more than one...only differences being the colors. The colors available are red, yellow, black, white, blue, and I believe another one or two, which can all be interemixxed to make virtually any color. The DTMs are designed to be an all in one product....self-etching (thus direct to metal), high build (surfacer) and tintable (to eliminate a sealer coat for uniform substrate).

Shannon

Long time, no post, Shannon. Glad to see you back, I always appreciated your knowledge and expertise. I'm monitoring this forum closely, as this is the phase of restoration that my Elky is in right now.

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"SSuper Dave" Palmer
A.C.E.S. #1483
Team Chevelle #32 Gold
1968 Chevelle
1970 El Camino (electrical system operating, Vortec engine just about to run, bodywork has begun!)

Thanks for the info. I got the products sheets of the ppg site today for both D822 primer and the Uniprime DTM. They are obviously different products, and have different recommended spray pressures, etc. Since I haven't bought a spray gun yet for the primer, I might hold off my choice of primer for a while. Also I will be stripping paint to see what is really under that substrate, and in the end I may need to be covering mostly bare metal. Thanks again for your comments.