Spent the last few days cleaning up the khaki door panels I snagged on eBay a couple months ago. They looked pretty good in the pictures but you never quite know until you see them in person, so I was a little nervous..but WOW I found set of diamonds in the rough! They were the only ones I stumbled on that didn’t have the infamous cracks. They cleaned up perfectly and look brand new.
Before installing them, I decided to reinforce the back side of the section that cracks. I’ve done a ton of reading on this topic because I was initially going to attempt to repair the cracks on my current panels, but opted to replace once I found this set.
I prepped the areas with Spray Nine degreaser and then wiped down with an alcohol pad. The alcohol left behind a powdery-looking residue, so I wiped it away with a brand new lint free rag. Next, I applied self-adhesive drywall tape. Did this for a little extra support but also to texturize the area. Finally, I applied tan JB Weld Plastic Bonder.
I closely compared my cracked doors as well as pictures of others’ cracked doors to make sure I was applying in the right spots. After closer inspection, I noticed an unreinforced seam in the plastic where it looks like the cracks happen. I applied the JB Weld along the top portion of the panel and down that seam. All of the cracks seem to happen at the seam in front of the door handle opening, but there’s another one of that same seam behind the door handle opening so I figured I may as well reinforce that section as well.
My pictures aren’t great because I was too caught up in what I was doing, but here they are nonetheless. Hopefully this trick keeps my panels intact!
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View attachment 400405This last picture shows the unsupported seam pretty well.
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Those aren't seams. They are witness marks from two pieces of steel meeting in the mold. Big molds like that are generally built from smaller pieces of steel and pieced together to form the whole Cavity and Core. Where those inserts line up, you'll get a witness line unless you spend a TON of time spotting and matching the steel. They didn't on the back...because its a "C" surface. They made it good enough to not be seen from the "A" surface (the one you see). You won't see those lines on class "A" surfaces.
Did you rough up the plastic before you put the seam sealer on? Looks lightly sanded.