The best fix so far for cracked Door Panels....
Mods: Hopefully you guys can eventually move it to the how-to section.
This does not cover aesthetics. This fix is all about preventing future cracking. My crack was not very large and all I have to do (after the following fix) is carefully trim the stressed plastic out of the crack and shoot a shot of color matched vinyl paint over it. Further, to fix the crack itself, all I had to do was push the plastic together, throw on some JB Weld with some reenforcing plastic over that.
Hardware: For each Panel- Ten #4-40 screws/bolts and ten #4 washers. The shortest I could find were ĹĒ, I cut them down to about 5/16. You just need to verify each screw (with washer) will go through with just enough thread to mate with the nut when finger tight.
After the panel is off, and before you take any of the staples out, drill your holes for the screws just above each staple except for the staple closest to the speaker - we are going to leave that one in.
Take out the staples, all but the one closest to the speaker.
A rotary toll will make this much easier, but I imagine you could just cut the holes with an exacto or even a small round file. The idea of this step is to not make the hole bigger, but to make each hole an oval - this is what will provide relief for future expansion/contraction.
Now clean up any rough plastic edges left from drilling the holes. I used a small chisel to clean both sides and an exacto to clean up the inside.
Starting from the end with the staple, begin putting your screws in with one washer on each screw. Put the screw in from the back If you donít you will have fitment problems getting the panel back on.
Make sure you LocTite each nut, and only tighten hand tight.
All done. Like I said, Iím just going to carefully clean up the stressed plastic and spray some color matched vinyl spray over it and it will be as good as new and I am confident it will not crack again.
I don't want people to miss the point of this mod: That the oval holes and washer/screw allow the panel to expand and contract unlike the staples or just replacing the staples with rivets.