door skin replacement? [Archive] - Chevelle Tech

: door skin replacement?


mxracer
Dec 31st, 04, 6:31 AM
I'm not to happy with the patch job i did on my lower door area's. I am thinking on replacing the skins,is this a real dificult job? i noticed eastwood sells a tool to remove the old one.do i need this? thanks for any help.Gary

baddbob71
Dec 31st, 04, 10:52 AM
A grinder works best IMO, I've seen damage done when using some of the tools available. Just take a grinder and run it along the edge untill it cuts through enabling the skin to be removed. If done properly a skin installation will last longer than a new oem door.

MARTINSR
Dec 31st, 04, 4:20 PM
The following instructions along with a number more can be found on Team Chevelles sister site Team Camaro. Click on the following link.. "Basics of Basics" on Team Camaro (http://www.camaros.net/cgi-bin/forum/ultimatebb.cgi?ubb=get_topic;f=3;t=005647;p=0)

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“Basics of Basics” Door skins
By Brian Martin

First off, to remove the old skin, take a grinder and grind the edge door where the skin folds around onto the door shell. Grind until you see the three layers of metal. Don’t worry if you grind a little too much, if the shell gets ground a little it is no big deal. On the spot welds you can drill them or grind them, sometimes both. By grind I mean a die grinder with a cut off wheel, just set the spinning wheel on the weld moving it back and forth till you have cut though eliminating the weld.

To prepare the new skin, take a DA or similar tool and sand the OUTER edge of fold in the new skin a little. I am talking about the edge as it will be folded onto your door shell. If you LIGHTLY sand this edge the lip will fold MUCH easier when you install the skin.

If you don’t plan on bonding the skin on, I highly recommend it. It is a corrosion fighter like none other. With the door sitting on it's back (the interior side down) clean the edge where the panel will bond with an abrasive disc to bare metal. Don't use a grinder, it removes metal. Then you will put a small ribbon of panel adhesive, NOT door skin adhesive but the Panel adhesive, it has a higher strength and longer working time. Spread out the adhesive with a plastic spreader so ALL the bare metal is covered. Then apply another thin ribbon on the inside edge of shell where it folds down towards the interior.
I don't know what primer you will find on the new skin, if you can be assured it is good quality and has bonded well, leave it. If it is questionable, then sand it out and apply a good epoxy primer.
After you have a good primer (or left alone) you need to simply scuff it with a red scuff pad down in the area that will be bonding. And believe me DON'T over do it with the bonding! It WILL go around the other side of the fold without even trying and get on your dolly and hammer!
Lay the skin down on the door and position it. Clamp it down at the top where you won't mess up the outer skin. I used a rubber dolly, if you don't have one take a flat dolly and tape a rag or something on it to provide a little cush. A neat home made dolly for this can be fashioned from a 5" long piece of 2x4 hard wood and a 3M rubber squeege glued to it. Hold the dolly on the top surface right over where you are going to fold the lip, strike up on the fold with your hammer while pushing down on the dolly, strike it at an angle so the metal "wants" to hold and NOT lift the skin off the door.
THE TRICK!...... Don't fold it very much at a time, I mean VERY LITTLE, about an 1/8" MAX, maybe even 1/16". Go around the WHOLE door before folding more. Go around and around until you have it folded down almost flat, about 1/16" from touching.
Turn the door over, being particularly careful not to rest the door in a way that will bend your new skin! Now strike down with the hammer while you are still supporting with the dolly to close up the fold a bit more.
ANOTHER TIP!....DON'T smash it down!!!! Two reasons, one you will distort the outside and two you need to leave the bonding in there for it to work.
STILL ANOTHER TIP!.... Use a number of hammers that closely match the shape of the door, if you are in the rounded area at the top of the door, use a domed hammer.

After all folding is done, fine tune the edge so that there are no high or low spots. You can run a vexin file over these areas to spot highs and lows and cut a LITTLE if you need off of high spots. Then using a DA on grinder mode with a 120 disc you "block" the panel around the edge to perfection.

You can spray a weld thru primer on a couple of inches or so at the corners so you can then weld there and not burn the adhesive. But be ready to trial fit the door and twist it if need be for your weld it. You should always trial fit the door before the adhesive cures and “massage” the door to fit well then weld the corners on the back side so the door can’t twist while the adhesive cures.


If you have any fears of not being able to get the door skin on and folded in the working time of the adhesive, don’t use it! All you need is a little tack weld at each corner on the inside at the folded lip. Just go ahead and prime all the hidden areas and after the skin is on, put a seam sealer on the folded seam and spray a cavity wax or underseal around the seam from the inside.


Read the recommendations on the adhesive you are using, some want the metal bare while other want it to be primed, read the tech sheets.

70isfine
Dec 31st, 04, 6:02 PM
That pretty much covers it. :cool: Just to add a little something. On a lot of new cars there is ZERO adjustment on the doors. So i do the follwing,it works out real well and may help a first timer. after the skin is removed i hang the door shell back on the car . Then i position the skin on the door frame and move it around until it is fitted perfectly on there.I clamp it in place using vice grips up top and rocker panel screw clamps at the bottom.This allows you to clamp it and have the door closed. Then i drill an 1/8 hole in two or three corners of the door (yes thru the front of the new skin)Then run some little screws in it to hold the skin.Now remove the screws and the skin and the door from the car. Now when you lay your glue down and put the skin on the frame,just line up the holes and run your screws in. No guessing,fits perfect everytime.Later when the glue is cured mig up the little holes. I find a door skin hammer and a rubber block work best for folding the edge.I clamp it with plenty of vice grips to hold it until i get the edge folded.Cut up mix stick works good to avoid denting the new panel with the clamps.I get some funny looks the first time guys in the shop see me do it,but i have to chuckle to myself when i see them bending,twisting and jerking on the door to get it to fit with the new skin on.

sevt_chevelle
Dec 31st, 04, 7:32 PM
Originally posted by 70isfine:
I get some funny looks the first time guys in the shop see me do it,but i have to chuckle to myself when i see them bending,twisting and jerking on the door to get it to fit with the new skin on. I do the same method. Learned the hard way on a chevy truck once smile.gif
The thing I use an air hammer snap on ph2045 short stroke. I turn down the air pressure to around 40psi and use a smoothing hammer head. Looks just like a regular hammer head but for an air hammer. I support the skin with a rubber dolly.
With the air hammer I can do a full skin like a chevy truck in around 15mins without filler.
The first time I did this at my new shop I had two guys laughing at me when I started. 20 mins they were asking me to show 'em how smile.gif

MARTINSR
Jan 1st, 05, 2:49 AM
I'll have to give that a try Eric, my wrist just can't take all the hammering anymore.

baddbob71
Jan 1st, 05, 9:51 AM
Hey Eric, Thanks for the air hammer tip, I will give it a try on the next skin. In all reality it should work the same as a regular hammer if the air pressure is turned down you gain more control.

sevt_chevelle
Jan 1st, 05, 11:49 AM
It works great!
The ole fashioned way I could NEVER master always had some amount of filler. Started doing this a few years ago and havent had a lick of filler since.

Mac and Matco sell the hammer head, for some reason snap on doesnt, Matco number M127.
On one side I grind the edge down so its flat. This way you get more contact area on the skin flange.

I find it works best with the door laying the stand with the skin facing up. I use my left hand to hold the dolly. With my left thumb I hold on to the edge of the hammer head. This helps keep the dolly and the hammer inline plus its stops any bucking, you can just glide the hammer down the flange.

IMO a short stroke air hammer is a MUST, the long stroke is just to much. 30 psi works great to start bending the flange then turn it up to around 40 to finish off.

MARTINSR
Jan 1st, 05, 12:58 PM
I just got one of those hammer head "bits" from Mac the other day, havn't even used it once. My old air hammer may not do the trick, I'll have to see.Damn, sounds like I may need a new air hammer.