Bodywork Basics

Replacing a damaged door skin: It can sound so daunting at first, like some epic struggle rife with jagged metal and flying sparks. But this job is considered simple in the world of bodywork. Why not just replace the entire door? Sometimes beneath that rusty, damaged or poorly repaired outer skin is a perfectly good inner door frame. That was the case with our Mini Cooper S. Now consider the fact that new and used doors for our car trade in the $1000 range, while properly fitting skins sell for around $100 from places like Mini Mania. The choice seems pretty obvious, doesn’t it?

Our expert body man, Tom Prescott of The Body Werks in Holly Hill, Florida, showed us how to properly replace a door skin using modern adhesive. We chose adhesive instead of old-fashioned welding because it’s quicker, doesn’t distort the metal, and has less of a tendency to rust later on.

1.

Our bodywork guru, Tom Prescott, came up to our shop one evening to show us how to properly change a door skin on our Mini Cooper S. Notice that we used a clean, open work area for this job and rested the door on a good, level stand.








2.

The first step was to grind the crease off of the old door skin. We used a 40-to-50-grit grinding wheel and were very careful not to eat into the door frame. Spot welds can also be drilled or ground out on the door’s backside. Hammering with a chisel, however, will likely damage the delicate frame.







3.

Once the crease was ground off and welds were removed, we gently started prying off the door skin with a wood chisel and grinding away the last little bits.








4.

Soon the badly damaged skin peeled right off, revealing that the frame needed a little bit of repair.







5.

The door frame’s surface must be absolutely flat and smooth to receive the new skin, so we cleaned up any sharp edges and the remains of the spot welds. We then painted the raw metal with Eastwood Self-Etching Weld-Thru Primer.





6.

Next, we test-fit the new skin from Heritage Garage. This company makes some high-quality panels for old Mini Coopers, and their door skin fit very well.






7.

For better adhesion, we ground away a bit of the new skin’s primer–just the areas that would attach to the door frame. We test-fit the skin for a second time, then test-fit the entire door on the car.





8.

Time to apply glue. We laid down a bead of 3M Automix Panel Bonding Adhesive along the entire door skin and door frame. A glue brush smoothed it out into an even layer.






9.

Door skin, meet door frame. Clamps can be useful at this stage–just make sure they don’t damage the door. Pieces of wooden paint stirrer sticks sandwiched between the clamps will help protect your work.





10.

To fully attach the skin, we used a special door-skin hammer and dolly designed to get into the awkward areas that this job produces. These tools are available online or at any auto body supply house. We source this kind of stuff from Higgs Auto Paint & Body Supplies in Holly Hill, Florida.

We started at the top and gently hammered our way around the door, tapping just hard enough to fold the skin around the frame. Then we went around the door again, making sure the skin was perfectly flat against the frame.

11.

That’s it: Our door is as good as new. We checked the fit on the car before the glue dried to make sure none of the pieces had shifted. From here the door could be primed, cured of any slight imperfections, then sanded and painted.

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Comments
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Tim Suddard
Tim Suddard Publisher
2/28/16 8:48 a.m.

Sorry, trying to remove a canoe and deleted the wrong post. A reader was asking about soda blasting damaging metal. We work with Blast Masters and they always neutralize anything they blast, so this is not an issue.

NOHOME
NOHOME PowerDork
2/29/16 12:40 p.m.

A word about the adhesive method.

After replacing a doorskin, you need to put the door on the car and make sure that it still fits. Often there will be a slight twist to the doorframe, and the fix is to give the door a good pull on the top or bottom. Once the door sits flush, you toss in a few spotwelds on the folded edge to lock it in.

Would the cure time on the adhesive allow you to do this?

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