Today I did my driver side door which has the typical crack that seems to happen in a lot of TJ's.
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I started by cleaning the door panel with the SEM Plastic&Leather prep (38353). This product is also a mild solvent and will not only clean any surface dirt off the panel it will also take a thin layer off of the plastic itself. This helped eliminate a couple sun faded areas nicely.
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I fixed the crack by drilling a small hole at the end of the crack and using an epoxy formulated for plastic to fill the crack/hole.
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I then applied the adhesion promoter and 3 light coats of SEM Color Coat in Khaki (5545) over the entire panel.
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The crack is barely noticeable up close. After the paint cures I will perform a very light buffing using my polisher. I found that this gives the coating a similar luster to the existing dash components when I did the defroster vent trim last week.
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EDIT: Buffed the top out with "Shop Towel" (Blue paper towels) and my buffer with a very light touch. and installed.
I'm happy with it and vs the cost and difficulty of finding a Khaki intact panel vs $60 in materials and some time it's a great fix that I think will last.
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The most difficult part of this whole fix was getting the retainer clip off the manual window crank. I didn't buy the tool and ended up getting it off with a left over angled wrench out of stamped steel that came with an IKEA bookcase I made several years ago. I suggest getting that tool if you try this.